DRAFT D
TNM-M-E-0001 Page
69
Note 1: The Handset Audio Output is same as passed to Loudspeaker, except that audio
response is always flat (no de-emphasis).
The Audio level on this pin is determined as follows:
– When Loudspeaker Muted: level is set by Data Volume setting (see
Programmer parameters)
– When Received Audio is present at Loudspeaker: level is determined by User
Volume setting.
– When an Alert is sounding: level is determined by Alert setting. The Alert
Tone will also be present on this line.
Note 2: The Mic Audio Input may be either Pre-emphasised, or passed flat to the
Transmitter. This is determined by the type of PTT command that keys the
Transmitter.
A.2. EXTERNAL INTERFACE CONNECTOR
The Transceiver rear end-cap is fitted with a male DB15 connector:
Figure A.2 SRM9000 External Interface Pinout (P2)
Name DB15 Pin numbers
-VE (Gnd) 1, 2, 9, 10
+VE (+13.8V) 4, 5, 11, 12
Speaker 6, 13
General Input-0 (PTT/RTS) 7
General Output-0 (CD/CTS) 8
Ignition_Sense Input 3
On/Off input 15
DB15(M) Plug
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