Contemporary Research 232-FMA - Manual (Page 11)

Control Cable Connections
All drawings show pin numbers relative to a PC COM port or Axcent3 DB-9 RS-232 control port.
Pin-outs to other types of control ports may vary. Pins 4 and 9 are momentary closures to GND (5).
Single Tuner
5 GND
2 RXD
3 TXD
RXD 2
GND 5
TXD 3
Control Wiring – Single Unit
9-pin D-sub
female
RS-232
Control Port
Preset Up 4
Preset Down 9
Multiple Tuners, AV6x4 Router
Up to three tuners can be daisy-chained from one RS-232 control port. Remember that you will need
to use the Unit# address in your programming when you control more than one tuner from the
same control port. You can also daisy-chain one or two tuners with an AV6x4 A/V Router. In this
application, set the Router to the lowest Unit#.
5 GND
2 RXD
3 TXD
RXD 2
GND 5
RS-232 Wiring – Two Units
Unit 2
9-pin D-sub
female
RS-232
Control Port
Unit 1
9-pin D-sub
female
TXD 3
GND 5
TXD 3
RXD 2
5 GND
2 RXD
3 TXD
RXD 2
GND 5
TXD 3
RS-232 Wiring – Three Units
Unit 3
9-pin D-sub
female
RS-232
Control Port
Unit 2
9-pin D-sub
female
Unit 1
9-pin D-sub
female
TXD 3
GND 5
GND 5
TXD 3
RXD 2
RXD 2
Contemporary Research 11 232-FMA FM Stereo Tuner