B&B Electronics 232SPS2 manual Appendix B Serial Port Connections, PH 815 433-5100 -- FAX 815

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).

232SPS24595 Manual Appendix BB-1

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

PH (815) 433-5100 -- FAX (815) 434-7094