FM VERSION DESCRIPTION ENG
Page 22
11.10 DIGITAL DATA PORT
15-pin female Interface connector provides 3 optoinsulated “trigger” inputs.
These inputs can be used to dynamically alter two RDS flags (TA and M/S) and to enable
Split operating mode in response to logic signal transitions.
INPUT 1 is used to carry external network ‘split’ command (ref to Section 13).
INPUT 2 is used to dynamically alter M/S RDS flag. Input enabling will cause LED 2 on
Front Panel to light.
INPUT 3 is used to dynamically alter TA RDS flag. Input enabling enabling will cause LED
3 on Front Panel to light.
The following table displays internal connection of Digital Port and how to provide (f.i.) an external TTL command
to Input # 1.
PIN
DESCRIPTION DIRECTION PIN DESCRIPTION DIRECTION
1
Cathode of photocoupler input 1 (split)
IN 9 GND /
2
Cathode of photocoupler input 2 (M/S)
IN 10 GND /
3
Cathode of photocoupler input 3 (TA)
IN 11 GND /
6
Anode of photocoupler input 1 (split)
IN 12 GND /
7
Anode of photocoupler input 2 (M/S)
IN 15 + Vcc OUT
8
Anode of photocoupler input 3 (TA)
IN
Pins 9, 10, 11, 12 are linked together and provide an insulated
GND connection.
A current-limited + Vdc source is available on pin 15 (+ 12 V via a 1K2 resistor).
