B&B Electronics 232SPS2 Benutzerhandbuch

232SPS2-3903 Manual

Appendix B: Serial Port Connections

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B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

APPENDIX B: SERIAL PORT CONNECTIONS

The next four sections will cover the required serial port

connections on the 232SPS2. Each section will list the required
connections and the optional connections that some systems may
require. Connections to the serial port of the 232SPS2 are made on
a female DB-25 connector.

SERIAL TO PARALLEL MODE, HARDWARE HANDSHAKING

The serial port of the 232SPS2 module is wired as a DCE

device. For proper operation the following connections must be
present:

1. Transmit Data (TD) from the host (DTE) must be

connected to Pin #2 on the 232SPS2 module.

2. Data Set Ready (DSR) from the host must be

connected to Pin #6 on the 232SPS2 module.

3. Signal Ground (SG) from the host must be

connected to Pin #7 on the 232SPS2 module.

If port powering the 232SPS2, these connections are
recommended:

4. Request to Send (RTS) from the host must be

connected to Pin #4 on the 232SPS2 module.

5. Data Terminal Ready (DTR) from the host must be

connected to Pin #20 on the 232SPS2 module.

Some software may require one or more of the following
connections:

6. Clear To Send (CTS) from the host should be

connected to Pin #5 on the 232SPS2 module.

7. Data Carrier Detect (DCD) from the host should be

connected to Pin #8 on the 232SPS2 module.

NOTE: IBM PC’s (or compatible) serial ports and serial printers are
both DTE devices. Therefore, a null modem cable (like a serial
printer cable!) must be used when connecting a PC’s serial port to
a printer. A null modem cable or serial printer cable should not be
used to connect to the 232SPS2 (unless your device is a DCE --
such as a modem).

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