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1.4.2
Radio 1 (Rx/Tx or Rx) and Radio 2 (Tx) connections (P1 and P4)
Note:
Radio 1 is connected to P4 and Radio 2 is connected to P1 as shown in the tables below.
The radios are normally connected pin to pin for GM300, GM350 and GM950.
Be sure that the cables are not longer than 1 meter (EMC requirements) and that the radios
have been programmed correctly for use with TRICK (refer to the section on 'Programming
the Radios' at the end of this chapter).
Rx/Tx Radio 1
connector P4
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
pin 9
pin 10
pin 11
pin 12
pin 13
pin 14
pin 15
pin 16
* Please refer to "RX Audio Inhibit on PL Detect" and "Console Tx Inhibit on Busy Channel"
described in the 'Functional Description and Applications' manual.
Installation and Programming Guide
Front view of connector (P1 and P4)
15
16
Table 1-1 Radio 1 Connections
Signal name
SPK-
Speaker signal negative from radio 1
R1-MOD
Modulation to radio 1
R1-PTT
PTT to radio 1
GPO
Special function
R1-FMOD
Flat modulation to radio, not used
R1-BUS+
SBEP serial data to/from radio 1
GROUND
Ground reference from radio 1
CSQ/PLD
CSQ or PL/DPL detect signal from radio 1
R1-GPI
Wildcard/parallel channel control to radio 1
R1-IGN
Start signal to radio 1
RXAF
Receive audio from radio 1
R1-GPI/O
Wildcard/parallel channel control to radio
R1-SWB+
Switched power from radio 1
R1-HOOK
Hook signal to radio 1
RSSI
RSSI signal from radio 1
SPK+
Speaker signal positive from radio 1
1
2
Signal description
*
: CSQ or PL/DPL Detect from radio 1
Installation
1-3
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