Relays
Four form C relay outputs are available, rated for 1.0 A at 30 VDC, or 0.3 A
at 120 VAC. Connect external devices to the contacts on the RELAY connec-
tor. When connecting to larger loads, connect an interposing relay between
the B1290 and the load.
Radio
If the alarms are to be announced over radio, connect TX to the transmit au-
dio of the radio, and RX to the receive audio. RX should always be connected to
squelched audio. Independent transmit level adjustments are available for
voice, DTMF and tone signals. Adjust the levels of the transmit audio sig-
nals using the programming phone or the software setup. For the receive
level adjustment, set the programmed level to match the level of the incom-
ing signal: for a -10 dBm received signal from the radio the programmed
value would be -10 dBm. The range of adjustment for both receive and
transmit signals is -20 dBm to 0 dBm.
The PTT output provides a ground closure through an open collector to sig-
nal the radio to transmit. Connect this point to the radio’s push-to-talk cir-
cuit. The maximum rating is 150 mA, 25V.
The COS input is used to indicate to the B1290 whether the radio channel is
busy. Connect this point to the output of the radio’s carrier-operated
switch or relay (COS or COR). In its default condition, the B1290 looks for a
high signal to indicate the channel is clear and a low signal when the chan-
nel is busy. The B1290 may also be programmed to recognize the reverse
polarity. To change this parameter, refer to the squelch polarity in System
Settings - Program Code 6. This input is internally pulled up to work with
open collector radio outputs. In its default program condition, the input is
pulled high when clear and driven low when busy.
Local Acknowledge
This input is used to acknowledge an alarm locally at the B1290 without
having to call in over the radio or telephone. Connect the ACK input to a
normally open contact which will be grounded to acknowledge the alarm.
Telephone
The telephone line is connected to the RJ11 jack labeled PHONE on the side
of the B1290. The line should be using the inner (red/green) pair. Audio
levels to the telephone line are fixed internally in conformance with FCC
regulations.
The telephone should always be the last item connected.
Caution: DO NOT plug the telephone line into the PGM jack, as damage could re-
sult to the B1290.
15
Getting Started