Read this Manual Carefully and Entirely Before Installing this Device


1.1 Specifications

Power supplied by the User: 12 V AC or DC (Min. 10.8 V AC or DC, Max. 14.5 V AC or DC)
Input from Supervised Loads (S1 to S8): 12 V AC or DC (Maximum 24 V AC or DC)
Output Contact Ratings: 1 A at 24 V AC or DC
Telephone On-Off Switch: When "On", connects the Unit to the Telephone Network
Maximum Power Consumption: 5 Watts
Operating Temperature Range: 0C to 60C (32F to 140F)
Overall Dimensions 20.2 x 20.2 x 3.8 cm (8" x 8" x 1.5")
Maximum Net Weight: 1650 grams (3.64 lbs)
Certification: D.O.C. #1023 2548 A

1.2 Included in this package

Before installing the IND-8, make sure the local Telecommunications Company allows it to be connected to its facilities. Check that the Company allows industrial users to install automatic equipment. The IND-8 must be installed using an approved method of connection. Customers should be aware that compliance with the above conditions may not prevent deterioration of service in some situations. Telecommunications Company regulations may not permit their equipment to be connected to customer-provided jacks.

The sticker of the Canadian Department of Communications certifies that this device is approved; this approval means that the IND-8 meets safety and operating standards as well as standards set to protect the telecommunications network.

This certified equipment must be maintained exclusively by a Canadian repair service authorized by the manufacturer. Your Telecommunications Company may require you to disconnect this device after it has malfunctioned or after repairs or alterations have been made to it by parties unauthorized by the manufacturer.

Users should ensure, for their own protection, that the building's electrical system and telephone lines are grounded to the building's metal water pipes, if any. This precaution is particularly important in rural areas.


The IND-8 lets you use telephone remote control to connect and disconnect up to eight loads (such as electric motors, lighting systems, heating elements, air conditioning systems, video cameras, etc.) and to check the operation of such systems through feedback without having to go to the site.

2.1 Operation

When hooked up to a standard private telephone line the IND-8 carries out commands to operate or stop the operation of loads to which it is connected. It does this in response to codes transmitted through a quality telephone touch-tone pad or through other quality telephone apparatus combining pulse and tone modes. If, at the location from which you call the IND-8 the telephone service does not accept touch-tone signals for dialing, you may use pulse for dialing and tone for commanding the functions of the IND. When calling the device from excessively noisy surroundings, cover the microphone of the handset so the noise will not interfere with the communication.

Several programming options are available to the user. These are described in sections 2.4, 2.9 and 4.0.

2.2 Access

The IND-8 can be actuated only by using a 4 digit access code programmmed into it by the user; a master code, also programmed by the user, will moreover allow you to change the access code as needed (See section 4.0 "Programming").

2.3 Definitions: "Output Channel" and "Control Circuit"

The term "Output Channel" (with dry contacts) refers to each of eight latching relays of the IND-8. The contact of each relay is connected to two terminals (1A and 1B, 2A and 2B, etc.) and through these terminals switches one external low voltage circuit (supplied by user). The user programs each of these contacts to be either normally open (NO) or normally closed (NC). Additionally, these contacts are programmed for either continuous action or momentary action, according to each application (see section 4.0 "Programming").

The term "Control Circuit", as used here, refers to one output circuit connected to the IND-8 and used to control one load only. Please note that if a load is to be controlled by means of momentary contact action (see sections 2.3.1, 2.3.2 and 2.4) two Output Channels are required to handle one Control Circuit.


2.3.1 A Control Circuit serving a motor needs two Output Channels of the IND-8, each programmed for momentary contact action (See Fig. 3, lines 02 to 04).

2.3.2 In the case of a lighting system using low voltage control, the Control Circuit will likewise take up two Output Channels of the IND-8, each programmed for momentary contact action (See Fig 5, lines 01 to 06).

2.3.3 A Control Circuit switching a hot water heater On and Off uses only one Output Channel, programmed for continuous contact action (Fig. 6).


2.4 Choice of contact action determines the number of available Control Circuits

When all of its eight Output Channels are programmed for continuous contact action (section 4.0), the IND-8 handles eight Control Circuits. When momentary contact action is selected, fewer than eight Control Circuits are available. See Mode Selection Table, Section 4.12.

2.4.1 Examples:

When controlling a motor, each of two Output Channels of the IND-8 must be programmed for momentary action. The Output Channel used for STARTING the motor will be programmed normally open (NO). The one used for STOPPING the motor will be programmed normally closed (NC). See Fig. 3. In the case of low voltage control of a lighting system, both Output Channels (On and Off) are programmed normally open (NO) and momentary contact action. See Fig. 5. The momentary pulse lasts half a second. If a pair of Output Channels is programmed for momentary contact action, the first push-button will switch the load On, the second will switch it Off.

2.5 Optional disabling of on-site control

The push-buttons of the IND-8 are used to control the eight Output Channels. If it is desired to exercise control over the use of the push-buttons, replace the jumper marked "key" on the circuit board with a key switch. To permanently prevent use of the push-buttons, cut the jumper. Note: These alterations should be made by a competent technician.

2.6 Questioning the IND-8 by telephone on the status of the loads

After reaching the device by telephone in accordance with the access procedures (See "Programming" and "Operation" sections), you can determine the status of a load by pressing the number of the Output Channel controlling the load, or the number of the first of a pair of Output Channels controlling the load; then press 9. The IND-8 emits a rising tone to signal that the load is functioning or a descending tone if it is not functioning. If the status so reported agrees with the commands previously given the IND-8 the device emits a single final beep to indicate the end of your check. If the check reveals a disaccord between a command given the IND-8 and the actual status of a load, a low tone error signal is repeated five times right after either the rising or descending tone (See section 2.8).

2.7 Input Channels for Load Monitoring

The IND-8 has eight Input Channels for receiving feedback (S1 to S8). Each Input Channel is associated with a Control Circuit and will receive at its terminals a binary signal of 0 V (Logic Low) or 12 to 24 V AC or DC (Logic High) from a transducer or switch. This is explained in section 2.8.

These feedback signals have three purposes:

NOTE: Input Channels S1 to S4 share terminal SC1 as a common return. Input Channels S5 to S8 share terminal SC2.

2.8 Checking for a disaccord between the Control Circuit of a load and that of the IND-8

The IND-8 is equipped with eight OPTO-COUPLERS for monitoring loads 1 through 8 through feedback received at terminals S1 to S8 respectively. This feedback must be provided by the user. Mount suitable On-Off, N.O. dry contact switches or transducers at the loads, arranged so as to positively detect stoppage of a load independently from the action of the IND-8 and independently from the control panel feeding the load. Wire to the appropriate S terminal (S1...S8) and to the appropriate common return terminal (See Note, section 2.7.3). Provide an independent 12 V or 24 V AC or DC source for this circuit, separate from the power supply of the IND-8. Examples of switches or transducers are a minimum RPM switch for monitoring a motor or fan load, a pressure switch for a compressor, a photocell relay for a lighting system etc. See schematic diagrams in section 9.0.

NOTE: Transducers used in a supervision loop should have contacts designed for low currents (12 mA). Contacts designed for higher currents may cause false stops.

Terminals S1 ... S8, when connected to proper feedback, determine whether the loads are in fact functioning or not. A feedback voltage of 0 V (the load is not functioning) is communicated to the user telephoning the IND-8 by means of a descending tone; a feedback voltage of 12 or 24 V AC or DC (the load is functioning) is signalled by means of a rising tone. In case of a contradiction between the status of a load as reported through feedback and the command status at its Output Channel on the IND-8, an error signal is emitted. On the IND-8 the LED of the load in question blinks to show this disaccord.

NOTE: When a pair of Output Channels is programmed for momentary contact action, wire the feedback circuit to the first of the two corresponding Input Terminals (for instance S1, not S2) leaving the other one unused.

2.8.1 Examples of disaccord:

2.9 "Auto-Off" option

Auto-Off is a feature of the IND-8 which the user has the option to program or to leave unused (see section 4.0 "Programming"). It is used in applications involving limit pressures or temperatures, pumps or motors or similar loads. Programming the Auto-Off option causes the IND-8 to instantly and permanently disconnect the load if a monitoring circuit (S1 ... S8) detects stoppage of a load which should be operating according to the position of the corresponding Output Channel. In the absence of a rechargeable battery source for the IND-8, the Auto-Off feature will disconnect the load immediately after a power failure.


2.10 Retention in memory of the status of the Output Channels

During power failures, latching relays of Output Channels programmed for continuous contact action and with the Auto-Off option inactive, retain in memory the commands received, whether or not backed up by a battery. After the return of power the status of the load will be the same as before. Output Channels programmed for momentary contact action will not provide a starting pulse after the return of power (except if the power failure occurred during the first half second after an on-site or telephone command. (See section 2.4.1)

Output Channels programmed with Auto-Off, and not backed up by a battery, will stop a load a few seconds after the end of a power failure by placing the contacts in the Off position. To avoid temporarily switching On a load during the interval between the return of power and the above-mentioned stop action, connect a contact of a time-delay relay set for 20 seconds in series with the low voltage supply of all the Control Circuits on the control panel of the loads. This contact should be normally open and in "On-delay" (see Fig. 3, reference line 01). Battery back-up is another solution.

2.11 Use with an Automatic Dialer

An IND-8 controlling a load that requires continuous monitoring must be powered by a rechargeable battery (see section 2.12) and the Auto-Off option must be programmed. A relay will have to be connected between the controls of such a load and a free zone of the automatic dialer of an existing security system linked to a 24 hour Surveillance Centre (see Fig. 2). If no free zone or no security system are available, have a dialer installed; firms specialized in security systems offer this service.

2.12 Power supply with and without rechargeable battery (Figure 1)

During a power failure, an IND-8 without a rechargeable battery memorizes the codes and the positions of the control relays. A unit equipped with a 12 V, 6 Ah rechargeable battery (supplied by user) can respond to telephone commands during a power failure. This off-the-shelf equipment (used in security systems) will make the IND-8 independent for 20 hours. The battery must serve only the IND-8.

An installation without a battery cannot respond to telephone calls during a power failure.

NOTE: The IND-8 has a built-in charger capable of handling batteries up to 12 V, 6 Ah.



3.1 Preliminary Operating Test

To supply power to the IND-8, connect terminals AC1 and AC2 to a 12 V AC source and connect the unit to a telephone jack by means of the cord supplied. First, test the response to the telephone by pressing the On/Off button. Use another telephone line and dial the number of the telephone to which the unit is connected (if, at the location from which you call the IND-8, the telephone service does not accept touch-tone signals for dialing, use pulse for dialing and tone for commanding the functions of the IND-8); the LED of the On/Off switch will light up in unison with the ringing of the telephone. The IND-8 will "answer" after five rings with a tone signal indicating that it is ready to receive your instructions. Press 1 four times and a "beep" will be heard. Wait a few seconds until the device "hangs up" by itself or press the asterisk to end the communication immediately.

Next, test manual switching of the eight output relays. LEDs 1 to 8 should be Off. Actuate push-button #1: the LED will blink. Press button #1 again: the LED will go out. Do the same for the other channels. If the unit does not respond as indicated it will have to be programmed again: see section of "Electrical Installation" and section 4.0 on "Programming"; then repeat this "Preliminary Operating Test".

3.2 Mechanical Installation

3.2.1 Mounting on a wall or other fixed surface:

Find the place where the IND-8 will be mounted.

Caution: The IND-8 was not designed to be used in corrosive, dusty or humid environments. If it must be used in such surroundings, it is recommended that the unit be protected by a hermetic transparent enclosure type NEMA 4. To minimize interference, do not install the IND-8 close to contactors or disconnect apparatus switching loads at voltages higher than 24 V.

3.2.2 Mounting on a junction box (8" x 8" x 4" or 8" x 8" x 6" if a rechargeable battery is used).

The cover of the IND-8 is designed to replace the cover of a standard electrical junction box of 8" x 8". Before obtaining a box check its interior dimensions and make sure that the enclosure containing the electronic circuit will fit into it easily and without obstruction (The enclosure of the IND-8 is 6 5/8" square below its flange).

3.3 Electrical Installation

3.3.1 Power supply to the IND-8

If you are installing the device with a rechargeable battery, see Fig. 1. If you are installing it without a rechargeable battery, a separate 120/12 V AC 60 Hertz approved transformer with a grounded enclosure is satisfactory (see fig. 1).

Recommended models: Frost FTP 2012, FTC 2012, FTC 3012, FTC 4012 or equivalent transformer rated 12 V, 20 VA, class 2.

3.3.2 Steps to follow:

3.4 Closing the unit

3.4.1 To protect the finish of the front cover, insert the cover mounting screws through the plastic washers before putting them through the holes in the front cover. Then put the tooth-lock washers over the screws so these washers intervene between the cover and the enclosure. This will ensure positive electrical contact.

3.4.2 Attach the assembly of cover, screws and washers to the enclosure.

3.4.3 Energize the transformer of the IND-8. (The loads remain disconnected.)

3.4.4 Now proceed with programming (see section 4.0).

3.5 Hooking up two IND units to one telephone line

You can connect two IND units (models IND-2 or models IND-8 or one of each) to a single telephone line in order to control more loads. To do this, program the first unit for zero rings and the second for five rings (see sections 4.2.3 and 4.8). This completes special programming for two IND units on one telephone line. The devices can now be reached as follows:

To access the first IND: dial the telephone number to which the two units are connected, let ring twice, hang up and dial again; at this second call the first IND will reply after one ring (even though it was programmed for zero).

To access the second IND: let your first call ring five times in accordance with the way the second IND was programmed (the first unit will not reply).

3.6 Answering Machine

You can also combine one IND-8 and an answering machine on one telephone line. In that case program the answering machine to reply after not less than 4 rings and program the IND-8 to answer after 0 rings. All regular callers will get through to the answering machine. However, the user of the IND-8 will hang up after two rings and then ring again within 60 seconds in order to communicate with the IND-8.


The reader is advised to make blank copies of sections 4.2.1 through 4.2.6 and write on the copies.

NOTE: Section 10 contains a complete example of programming.

4.1 At the factory the IND-8 is programmed as follows:

The personal access code is at 1111
The seven digit master code is at 0000000
The number of rings (user choice from 0 to 9) is at 5
The MODE number (1 digit) is at 1
The status of the Output Channels (0=NO, 1=NC) is at 00000000
Auto-Off (0=No, 1=Yes) is at 00000000

4.2 Programming procedure:

Choose your codes and decide according to the requirements of the installation and the functions desired what options you wish to program. Write the codes in the spaces provided. Keep your notes.

4.3 Dial the number of the telephone to which the unit is connected, using another telephone line than the one of the IND-8. Use either a Touch-Tone telephone or a telephone that has pulse and tone modes, "Pulse" being used to dial the number and "Tone" to command the IND-8.

4.4 After the number of rings which you programmed under 4.2.3 the unit will reply with a tone indicating that it is ready to receive your instructions.

4.5 Dial 0000000 (master code programmed by the factory). The IND-8 confirms that it is ready to receive your new programming codes by a succession of three identical tones. Continue within ten seconds or the unit will "hang up".

4.6 Dial the new access code (see section 4.2.1). A brief tone tells you that it has been received. (If applicable, communicate this access code to the person responsible for operating the loads in question)

4.7 Dial the new master code as written in 4.2.2. A brief tone signals it has been memorized. Note and keep these seven digits in a safe place.

4.8 Press the digit selected under 4.2.3 to indicate the number of rings before the unit replies. A short tone acknowledges your command. (For instructing two IND units connected to one telephone line, see section 3.5 and for instructions regarding an answering machine, see section 3.6.)

4.9 Select the appropriate Mode. There are five Modes to choose from. Consult the table in section 4.12 and press on the telephone keypad the one digit that denotes the Mode you wish to employ. This programs all of the Output Channels at once for either momentary or continuous contact action or the required combination thereof. A brief tone confirms receipt of your instruction.

4.10 Program each Output Channel to be either normally open (NO) or normally closed (NC) by pressing, in sequence, starting with Output Channel 1, "0" for NO or "1" for NC. One brief tone confirms receipt of this set of instructions.

4.11 According to the Mode selected in 4.9, program the Output Channels for Auto-Off: "1" for Yes, "0" for No. The software of the IND-8 here limits the number of digits that can be entered. For example, in case of Mode 5 (four load Control Circuits using eight Output Channels, and all programmed for momentary contact action) programming for the Auto-Off option applies only to four Control Circuits. After entry of four consecutive digits ("1" or "0") a long tone will signal the end of programming and the device will "hang up". The IND-8 keeps the instructions in memory even during a power failure.


MODE 1 8 Control Circuits(all having continuous action Output Channels)
MODE 2 7 Control Circuits(one pair of momentary action channels, 6 continuous action channels)
MODE 3 6 Control Circuits(two pair of momentary action channels, 4 continuous action channels)
MODE 4 5 Control Circuits(three pairs of momentary action channels, 2 continuous action channels)
MODE 5 4 Control Circuits (four pairs of momentary action channels)
Chan. # Contact Action Chan. # Contact Action Chan. # Contact Action Chan. # Contact Action Chan. # Contact Action
1 continuous 1 momentary 1 momentary 1 momentary 1 momentary
2 continuous 2 2 2 2
3 continuous 3 continuous 3 momentary 3 momentary 3 momentary
4 continuous 4 continuous 4 4 4
5 continuous 5 continuous 5 continuous 5 momentary 5 momentary
6 continuous 6 continuous 6 continuous 6 6
7 continuous 7 continuous 7 continuous 7 continuous 7 momentary
8 continuous 8 continuous 8 continuous 8 continuous 8


Your programming action will follow one of these five patterns, depending on which Mode you have selected. Each x represents a digit of your choice.

(BETWEEN 0 & 9)
NO=0 NC=1
xxxx xxxxxxx x 1 x x x x x x x x
xxxx xxxxxxx x 2 x x x x x x x x
xxxx xxxxxxx x 3 x x x x x x x x
xxxx xxxxxxx x 4 x x x x x x x x
xxxx xxxxxxx x 5 x x x x x x x x
See section 4.2.1 See section 4.2.2 See section 4.2.3 See section 4.2.4 See section 4.2.5
1 2 3 4 5 6 7 8
x x x x x x x x
x x x x x x x
x x x x x x
x x x x x
x x x x
See section 4.2.6

5. HOW TO PROGRAM A NEW ACCESS CODE, OR A NEW MASTER CODE (should you have forgotten it)

5.1 Changing only the access code:
after the IND-8 has replied to your telephone call, dial the master code and then a new access code as in step 4.6. Then hang up. The other codes will not be changed by this action.

5.2 Changing both access code and master code:
if you have forgotten the master code, repeat step of the "Electrical Installation" section. Now program a new access code and a new master code by going through steps 4.3 to 4.7 described under "Programming". The other codes will still be in memory. If you want to change those options, again run through all the stages described under "Programming". Note: The physical reset of the printed circuit does not affect the selection of options made earlier.



6.1 Press the On/Off button. The telephone line is connected to the unit and the red LED lights up.

6.2 Telephone the IND-8 using another line (see section 4.3); it replies after the programmed number of rings.

6.3 Wait for the tone indicating that the unit is ready to receive your instructions.

6.4 After this signal, dial the 4 digit access code and wait for another tone.

6.5 Now press:
first: the number of the load you want to command (1 ... 8) next: the desired status of the output relay: "0" for "Off" or "1" for On (assuming the contact has been programmed normally open).

NOTE: if at stage 4.2.4 you have selected a Mode that requires one or more pairs of Output Channels programmed for momentary contact action, dialing a number for the second channel in such a pair will be refused; the device repeats a low tone error signal 5 times. The LED of the second channel stays out. This indicates that the channel is reserved.

The unit acknowledges receipt of every command by means of a tone: a descending tone (from high to low) signals that the load is disconnected and a rising tone (from low to high), that it is connected. A short beep confirms that the unit has understood and is carrying out your command. You can then dial a new command orask a report on the status of the loads (See section 2.6).

If you press the asterisk button (*) the IND-8 will "hang up" immediately.

1ST Digit
identifies the load
  2 ND Digit
indicates function
1 = Load 1 - 0 = stop
*2 = Load 2 - 1 = start
3 = Load 3 - 9 = request for status of the load
*4 = Load 4 -  
5 = Load 5 -  
*6 = Load 6 -  
7 = Load 7 -  
*8 = Load 8 -  

*these numbers are refused in the case of any channel that has been programmed for momentary action.


7.1 All accessories used in the installation of the IND-8 must be CSA approved.

7.2 The manufacturer reserves the right to refuse the return of a unit that has been altered or tampered with.

7.3 The examples and diagrams in this User Manual are of a generic nature and are intended only to clarify the operation and the installation of the IND-8.

7.4 It is essential that installations of the IND-8 be made or supervised by personnel having expertise in industrial controls.
The IND-8 must not be used to switch DANGEROUS LOADS that could cause material damage, bodily harm or business interruption. If the unit is used for the remote control of loads that require continuous supervision, both the Auto-Off option and a rechargeable battery power supply are essential. A signal from the control panel supplying the loads must be monitored by a Surveillance Center in order to allow immediate detection of any abnormal functioning of the load. (Please see section 2.11).

7.5 Provide electrical interlocks and appropriate limit detectors to control all critical parameters affected by the loads that are switched by the IND-8. This is highly important in order to avoid problems that might otherwise result from a failure of the IND-8. (See also section 2.9.)


7.7 In case the IND-8 malfunctions, do not return it to your supplier until after you have checked if all installation requirements have been complied with. Then, before starting up the system again, disconnect the power supply of the IND-8 (including the battery) for a few seconds. This will accomplish a total reset of the device.


The manufacturer warrants that if any manufacturing defect becomes apparent in this product within one year from the original date of purchase (as per the original proof of purchase), the product will be repaired or replaced free of charge.

This warranty does not cover damage due to accidents, misuse, and improper or illegal installation, or overvoltage caused by lightning. Nor does it cover a unit that has been repaired or modified in any way by any person or corporation other than the manufacturer or its authorized delegate.

This document constitutes the sole warranty offered by the manufacturer. The warranty is limited to the repair or replacement, at the manufacturer's option, of a defective unit. No other responsibility, explicit or implicit, is assumed. The manufacturer will not be responsible for damages, delays or inconvenience caused by the product's failure or non-performance or by improper use or installation of the product. The user must read this Manual (including this warranty) before having this equipment installed.

If any manufacturing defect becomes apparent in this equipment within the warranty period the product must be returned to the distributor, transportation prepaid and insured, in its original packaging. Repair and maintenance of this equipment must be performed by the manufacturer or by a repair center authorized by the manufacturer.

The provisions of this written warranty are in addition to and not in modification of or substraction from the statutory warranties and other rights and remedies contained in any applicable legislation and to the extent that any provisions herein purport to disclaim, exclude or limit any such statutory warranties and other rights and remedies, such provisions shall be deemed to be amended to the extent necessary to comply therewith.

This warranty is nul and void if the above stipulations are not complied with and the manufacturer declines any responsibility for the consequences of an installation of the product not made in compliance with the above instructions.

The Manufacturer reserves the right to change specifications without notice.

Patent Numbers: 5 119 412; 2 022 293; 4 845 773; 1 274 328.

Printed in Canada
Copyright 1995-2014 Enertel Controls Inc. (Canada)