User manual

Using the RDS SECTION (FM version ONLY) ENG
Page 70
29.3 TA REMOTE CONTROL TROUGH OPTO INTERFACE
The TA flag may be activated through a dedicated input on the OPTO INTERFACE port (the interface is available as an
option).
The OPTO-INPUT Port is a 9-pin female Interface (on DB-9 connector) which provides 2
optoinsulated “trigger” inputs: one for SPLIT mode activation and one for TA flag switching
Once enabled, TA input activation will cause WARNING LED on Front Panel to light.
The following table displays internal connection of Digital Port.
PIN DESCRIPTION
PIN DESCRIPTION
1
Cathode of photocoupler SPLIT input
6 GND
2
Anode of photocoupler SPLIT input
7 GND
3 + 5 V via 470 Ohm resistor 8 GND
4
Anode of photocoupler TA input
9 GND
5
Cathode of photocoupler TA input
Pins 6, 7, 8, 9 are linked together and provide an insulated GND connection.
A current-limited + Vdc source is available on pin 3 (+ 5 V via 470 Ohm resistor).
The TA flag may ba activated either by a TTL command or a CLEAN CONTACT
EXAMPLE N° 1 – TA activation by TTL command
(connector internal view)
external TTL signal must be applied through a 470 Ohm
carbon resistor to the TA photodiode (pins 1 and 2). Max current
allowed: 10 mA. Nominal: 5 mA
EXAMPLE N° 2 – TA activation by clean contact
(connector internal view)
The external switch (clean contact) is used to shortcut pin 3 and 4 (with pin 5 and 9 tied together)