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Rs-232 cable connections, Single tuner, Multiple tuners – Contemporary Research 232-MCT User Manual

Page 15

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Contemporary Research

15

232-MCT Mono Caption Tuner

RS-232 Cable Connections


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

Channel Up 4

Channel Down 9

RS-232 wiring for control or programming should only use pins 2, 3, 5. Standard null modem cables

such as the CC-COM cable that include all wires can be used for programming and control.

Multiple Tuners

Up to nine 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.
Set the first unit in the RS-232 chain to the highest Unit#, then wire in sequence to the last tuner in

the chain. The reason for this is that CR tuners use an intelligent data bus - the highest number tuner

receives all commands, and then passes on commands addressed to tuners with lower unit numbers.

The next tuner in the chain does the same, and so on until the last 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