Clarity SN-4620-1080 Connecting RS232 Communication, Connecting for RS232 control, RS232 IDs

2.6 Connecting RS232 Communication

RS232 control is not necessary for operation, but it is a convenient way to control Bay Cat Xs from a distance.

RS232 communication allows a computer to control one or more units using the computer’s serial port. Almost every- thing you can do with the remote, you can do with RS232 commands. Plus, you can send inquiries to the units and find out the current settings and values.

To connect a computer to the first unit, use an adapter on the computer’s serial port connector to convert this to an RJ45 connector.

1.Obtain an adapter that has a female 9-pin connector.

2.Wire it as shown in the illustration and table below. Only three wires are required. Clip off the other wires, or tuck them into the connector body.

Wiring the adapter

To go from 9-pin D-sub serial connector on the back of the ccomputer to an RJ45 connector, use a standard RJ45-to-9-pin adapter. Wire it internally as shown. The wiring shown for this adapter is correct for straight-thrucables. Straight-thru cables are wired 1-to-1, 2-to-2, etc.

Yellow wire	pin 3
Black wire	pin 2
Green wire	pin 5
RJ45	9-pin
6	3

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Connecting for RS232 control

Use Cat-5 cable to connect from the computer (with the adapter in place) to the first unit’s RS232 In connector.

From the first unit, connect RS232 Out to the next unit’s RS232 In. Continue in this way until all units are in the loop. The order of units in the loop does not matter because each unit in the array must have a unique address.

✎The loopthrough limit is approximately 30 units in typical situations. However, if the units are spaced far apart or the total length of the loopthrough is very long, this limit may be reduced. You may need multiple RS232 sources.

RS232 IDs

Each unit in the loop must have a unique RS232 ID. Open the Serial Port Settings menu for each unit. On the

5 4 3 2 1

9 8 7 6

1 8

female 9-pin

RJ45 looking into the socket.

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