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232SPS24595 Manual Appendix B B-5
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Some printers may require one or more of the following connections:
6. Data Set Ready (DSR) from the printer must be
connected to Pin #6 on the 232SPS2 module.
7. Clear To Send (CTS) from the printer should be
connected to Pin #5 on the 232SPS2 module.
8. Data Carrier Detect (DCD) from the printer 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).
TABLE B-3
DB-25 Serial Port Connections (P to S)
Serial Port
(DTE)
DB-25S
Signal Name Direction
232SPS2
(DCE)
DB-25P
Pin #
2 Transmit Data -----------> 2
3 Receive Data <----------- 3
4 Request to Send 4
5 Clear to Send <----------- 5**
6 Data Set Ready <----------- 6**
7 Signal Ground 7
8 Carrier Detect <----------- 8**
20 Data Terminal
Ready
-----------> 20
22 Ring Indicator 22