Installation guide

NOTES CONCERNING THE MODEL 1431/32 AUTO-DIAL MODEMS cont.

to a 7-bit word, the parity is automatically set to even).

The display may now show BAUD RATE =150 ?. This is the default communication

speed. Press the NO key until the display shows BAUD RATE =1200 ?. Press the

RETURN/ ENTER key to accept this value. The panel will now return to date and time.

OPERATING INFORMATION

DIALLING OUT: Whenever any activity occurs on the control panel that results in the logging

of an event, the panel will immediately send the logged data to the central/monitoring station.

The Model 1431/1432 auto-dial modem contains a number of status LEDs. When the dial

command string is sent from the EUROPLEX control panel to the Model 1431/1432 auto-dial

modem, the red receive data (RX) LED and the yellow transmit data (TX) LED will flicker

indicating receipt of the dial string. In a few moments, the line seizure relay will click and the

green off-hook (OH) LED will light to indicate that the modem is off-hook and waiting for a dial

tone. (If you have selected pulse dialling (.... DP), you will hear the dial pulse pattern.) When the

call is established, a handshake tone will be sent from the Model 1430 auto-answer modem

indicated by the green data carrier detect (DCD) LED coming on. The auto-dial modem TX and

RX LEDs will flicker as long as data is being transmitted. The Model 1430 auto-answer modem

will issue a hang-up command and the DCD and OH LEDs will extinguish, indicating that the

call is complete.

LINE FAULT DETECTION: Both Model 1431 and Model 1432 auto-dial modems are

equipped with line fault detection. The line fault detection circuit determines if the voltage

available on the telephone line is less than 4 volts DC. Normally the voltage will be 48 to 52

volts DC when the telephone set is on-hook and approximately 6 to 9 volts DC when the

telephone is in use. The Model 1431 auto-dial modem has only one-line capability and is suitable

for residential installations. The Model 1432 has two-line capability and is suitable for

commercial/industrial burglary and fire alarm monitoring installations. When the primary line

fails, the secondary line is connected to the auto-dial modem input. Both primary and secondary

telephone lines have line seizure relays to disconnect the “house” phone and/or to disconnect a

caller using the “house” phone. The line fault circuit controls an SPST relay and provides a set of

dry contacts (open on fault) which can be connected to a LEM (APLEX/MIDIPLEX) or control

panel (MIDIPLEX/ DIRECTPLEX) zone input. A zone type, TELFLT, should be assigned to the

appropriate zone number to log line fault activity. In addition, there is one red LED, LF1, on the

Model 1431 autodial modem and two red LEDs, LF1 and LF2, on the Model 1432. When a line

fault condition occurs, the appropriate line fault (LF) LED will light. Note that the line fault

detection occurs on a timed basis and momentary interruptions of the telephone line do not result

in an immediate change of the line fault LED status.