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2.4 SERIAL INTERFACE

The VXI-5534 has four 9 pin DE-9P connectors with lock studs that independently provide either

RS-232, RS-423 or RS-422/RS-485 signals. Table 2-1 shows the serial signal assignments and the

signal direction relative to the VXI-5534.

TABLE 2-1 SERIAL INTERFACE PIN ASSIGNMENTS

Pin Signals and Direction

Number RS-232/RS-423 RS-485 FD RS-485 HD

1 DCD ← Rx+ ← -

2 Rx ← Rx- ← -

3 Tx → Tx- → Tx/Rx-

4 DTR → Tx+ → Tx/Rx+

5 DGND DGND

6 DSR ← CLKO+ → -

7 RTS → CLKO- → -

8 CTS ← CLKI+ ← -

9 RxCLK ← CLKI- ← -

Shell Chassis Chassis Chassis

Note: Signal direction arrows ← = in to VXI-5534, → = out from VXI-5534

2.4.1 RS-232 Connections

When RS-232C signals are selected, the signal pinouts are compatible with those on the 9-pin COM

port of an IBM AT or clone computer. The VXI-5534's RS-232 signals can be expanded out to a 25

pin connector with the use of a standard 9 pin-to-pin- 25 pin adapter cable. The RS-232 column in

Table 2-1 shows the RS-232 signal pin assignments and their direction relative to the VXI-5534.

Figure 2-3 shows the standard 9 pin to 25 pin adapter wiring. For minimum RS-232 connections,

use the serial signals on pins 2, 3 and 5. Jumper the unused RS-232 control lines back to themselves

as follows: RTS to CTS and DTR to DSR and DCD. Implement either the hardware or software flow

control if the serial messages could overflow either devices' receive buffer.

9 Pin Connector

25 Pin Connector

DCD 1 8 DCD

RxD 2 3 RxD

TxD 3 2 TxD

DTR 4 20 DTR

GND 5 7 GND

DSR 6 6 DSR

RTS 7 4 RTS

CTS 8 5 CTS

RI 9 22 RI

Figure 2-3 DTE 9 Pin to 25 Pin Adapter

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Samsung SMO-150QP Spécifications Page 25