Motorola GM Series Service Manual

2-6 MAINTENANCE
CH ACT Channel Activity Indicator Signal (Fast Squelch)
CH KP ID Control Head Keypad ID (Data) Lines
CH REQUEST Control Head Request from Control Head *P
CLK Clock Signal
CNTLVLTG PA Power Control Voltage
CNTR AUDIO Audio Lines of the Controller
COL x Keypad Matrix Column x
CSX Chip Select Line PCIC / FRACN
DATA Data Signal
DC POWER ON Electronic Switching On or Off of the Radio's Voltage Regulators
DISCAUDIO Audio Output Signal from the Receiver IC
ECLK Clock (not used)
EE CS EEPROM Chip Select
EMERGENCY CONTROL Emergency Line to switch on the Radio's Voltage Regulators
EXP BD REQ Service Request Line from Expansion Board
EXP1 CS Expansion Board Chip Select 1
EXP2 CS Expansion Board Chip Select 2
EXT KP COL External Keypad Matrix Column Signal
EXT KP ROW External Keypad Matrix Row Signal
EXT MIC External (from Accessory Connector) Microphone Input
EXT SWB+ External Switched 13.2V Supply Voltage
F1200 Interrupt Line from ASFIC CMP
FECTRL 1 Control Voltage for Front End Filter
FECTRL 2 Control Voltage for Front End Attenuator Switch
FLASH CE Flash Chip Select
FLASH OE Flash Output Enable
FLAT RX SND Option Board Audio Output Signal
FLAT TX RTN Flat TX Input from Option Board and Accessory Connector
FLT A+ Filtered 13.2 V Supply Voltage
GP x IN General Purpose Input x
GP x IN ACC y General Purpose Input x from Accessory Connector Pin y
GP x IN OUT ACC y General Purpose Input /Output x from Accessory Connector Pin
y
GP x OUT General Purpose Output x
GP x OUT ACC y General Purpose Input x from Accessory Connector Pin y
GPIO General Purpose Input Output Lines
HANDSET AUDIO Handset Audio Output
HOOK Hang-up Switch Input
HSIO High Speed Clock In / Data Out
IF First Intermediate Frequency Signal
IGNITION CONTROL Ignition Line to switch on the Radio's Voltage Regulators

Motorola GM Series Specifications

General

Channels	16
Waterproof	No
Frequency Range	VHF: 136-174 MHz
Signaling	DTMF, MDC1200
Dimensions	56 x 175 x 218 mm