Contemporary Research 232-STS Manual download pdf (Page 15)

Contemporary Research 15 232-STS Stereo S-Video TV Tuner

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. Cables with all pins wired can lock out

front-panel programming and data communication (Pins 4 and 9 are inputs).

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

TXD 3

RXD 2

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Contemporary Research 232-STS Manual Page 15

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