October, 1996 6880902Z36-B 6-19
GM300 Radio Service Software Manual Accessory Connector (16 Channel Models Only)
Accessory Connector Function Tables
6
6.3 Accessory Connector Function Tables
Table 6-2. Accessory Connector Input Functions
Function Function Type Description
NULL1 Independent Pin has no function
Emergency Switch Independent Connection to emergency switch for RapidCall
PA Switch Dependent Inhibits PTT for Public Address
Tx PL Inhibit Independent When active, the radio strips PL from any transmis-
sion
TOC Disable Independent When active, disables TPL/DPL turn off code at the
end of Tx
Mic Off Hook Independent Indicates to radio when a remote microphone is off
hook
Page PTT Dependent PTT for paging or data encoders using flat Tx audio
Tx Audio Mute Independent When active, inhibits microphone audio from
being sent
Data Ready Dependent Input from DTMF decoder board
DTMF Data Dependent Input from DTMF decoder board
Rx Audio Mute Independent Mutes received audio for data applications
Special Off Hook Independent Same as I/O Off Hook but also readies audio
amplifier to accept externally generated sidetones
Channel Select 1 Independent BCD channel selector input (all released: opera-
tor’s channel). Least significant bit.
Channel Select 2 Independent BCD channel selector input (all released: opera-
tor’s channel)
Channel Select 3 Independent BCD channel selector input (all released: opera-
tor’s channel)
Channel Select 4 Independent BCD channel selector input (all released: opera-
tor’s channel)
Channel Select 5 Independent BCD channel selector input (all released: opera-
tor’s channel). Most significant bit.
External Call Button Independent Transmits a specified encode sequence
Auto PTT Independent Strips PTT ID and system busy alert tone
Request-To-Send Independent Strips PTT ID (except for Select V) and executes a
PL strip and a TOC disable
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