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RS-232 Interface Elgar CW-P Series

4-2 Programming Manual

4.3 RS-232 Connector

The RS-232 connector is a 9-pin male Subminiature-D type; its pinout is presented

below:

Pin Number

Function

Input/Output

RxD, Receive Data

Input

TxD, Transmit Data

Output

Connected to Pin-6

—

Signal Ground

—

Connected to Pin-4

—

Connected to Pin-8

—

Connected to Pin-7

—

1,9

Not Used

—

When connecting the CW-P to a controller, ensure that the RxD line of the CW-P

connects to the TxD line of the controller, and that the TxD line of the CW-P connects

to the RxD line of the controller. This could be accomplished using a null-modem

cable.

There are two versions of the null-modem cable: a 9-pin/9-pin and a 9-pin/25-pin.

The 9-pin/9-pin cable swaps Pin-2 and Pin-3 between the two ends of the cable, so

that the proper RxD and TxD connections are made, while the 9-pin/25-pin cable

connects Pin-2 to Pin-2 and Pin-3 to Pin-3. Also, because the CW-P connector has

Pin-4 connected to Pin-6, and Pin-7 connected to Pin-8, the null-modem cables would

connect the following control lines: DSR to DTR and CTS to RTS.

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Ametek CW Series Programming Manual Manuale Utente Pagina 17