Installation
68P81096E37-N
33
06/28/05
Table 4. System Connector – Commonly Used Pins
Pin Function
Pin #
Pin Signal Characteristics
Name Description
RdStat
TTL compatible logic output
indicating Rx. Activation
status.
C2, B21,
B3/C3
0.0 to 0.2Vdc with squelched receiver,
4.8 to 5.2Vdc with unsquelched receiver.
Disc. Rx.
Audio
Unfiltered and unsquelched
discriminator audio without
de-emphasis.
C17
80mV minimum to 400mV maximum for
60% system deviation. Output level is RSS
programmable.
RSSI
DC output volts related to
received carrier level.
C11
Typically 0.5Vdc for –120dBm to 3.5 Vdc
for –40 dBm carrier. Variation with carrier
level @ approximately 40mV/dBm.
Cntrl
14.2V
14.2 volts dc output.
For dc-only 250W power
supplies, this voltage is equal
to the input supply voltage.
A18, B18, C18
C32, B32, C32
Total current through all of these pins
should not exceed 1Amp.
5 V
5.1 ± 0.25 volts dc output.
A20, B20, C20
Total current through all of these pins
should not exceed 500 mA.
GND
Ground.
A19, B19, C19
A27, B27, C27
A31, B31, C31
Total current through all of these pins
should not exceed 1.5 Amp.
Aux.Tx
Audio
Tx. modulation input from
external source.
A17
RSS programmable sensitivity.
For R03.01 (host software) and earlier, the
fixed sensitivity is @ 172 mVrms for 60%
system deviation.
RSS programmable for pre-emphasized
or flat response. DC 2.4V. High
impedance input.
Ext. PTT
External Tx. keying signal.
C10
Grounding Ext. PTT pin causes Tx to key.
5.0Vdc on pin when Tx is not keyed.
Note: To transmit signalling code (PL /
DPL) by external PTT, it should be mapped
(via RSS) to Wireline, and external modula-
tion input should be routed to wireline.
AC_Fail
Logic output to indicate failure
of AC line input.
A4
Requires a Battery Revert dc supply. Line
goes high (5.0Vdc) if AC fails.
Wireline
Pair 3+/–
Additional wireline for other
functions.
C28, C30
Line sensitivity and operation identical to
line pairs 1 and 2 (see Table 10).
Wireline
Pair 4+/–
B28, B30
