Service manual

DATA INTERFACE DESCRIPTION
A-5
April 2001
Part No. 001-9800-203
RX CALL - The asserted condition indicates that a
call is being received (either voice or data).
RX DATA GROUP - The asserted condition indicates
that a call is being received on a data group.
SEND CALL GUARD - The asserted condition indi-
cates to an external device when the radio is transmit-
ting that it should send the transmit tone or other
signaling.
TX FAIL - The asserted condition indicates that an
attempted PTT or DATA PTT channel access has
failed. Possible reasons for this failure on a trunking
system are an out of range or system busy condition.
On a conventional channel it usually means the
channel is busy. This signal is also asserted when a
transmitter time-out occurs or an over voltage condi-
tion exists. It is not released until all “PTT” signals
have been released.
Table A-2 Input/Output Line Programmable Functions
Line Name Origin Direction
Functions
Low Tier Mid Tier High Tier & Data
Sw Bat Out J301-1 Out Fixed Fixed Fixed
Rx Filt Out J301-2 Out Fixed Fixed Fixed
Tx Filt In J301-3 In Fixed Fixed Fixed
TxD J301-4 Out Fixed Fixed Fixed
RxD J301-5 In Fixed Fixed Fixed
Transmit J301-6 Out Fixed Fixed Fixed
Pwr Sw J301-11 In Fixed Fixed Fixed
8V Out J301-12 Out Fixed Fixed Fixed
Ground J301-13 N/A Fixed Fixed Fixed
Ext Serv Req J301-8 In Ext Serv Req Ext Serv Req Ext Serv Req
In 2 J301-7 In Data PTT
Data PTT Revert
PTT
Call Guard Disable
Data PTT
Data PTT Revert
PTT
Audio Mute
Call Guard
Call Guard Disable
Data ARQ
Data PTT
Data PTT Revert
Emergency
Ext Call Guard
Horn
PTT
PTT Inhibit
In 3 W301 In Ext Call Guard Audio Mute
Call Guard
Call Guard Disable
Ext Call Guard
Data ARQ
Audio Mute
Call Guard
Call Guard Disable
Data ARQ
Data PTT
Data PTT Revert
Emergency
Ext Call Guard
Horn
PTT
PTT Inhibit