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Documentation Number 232D4SS84502 Manual 9
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
The 232D4SS8 has eight ports labeled "A - H". Refer to “Rear
View”. Any of these ports can be manufactured to meet either RS-
232 or RS-422/485 electrical characteristics. The 232D4SS8 comes
standard with four RS-232 ports and four ports that are RS-232 or
RS-485 depending on the pins that you use.
RS-232 Configuration
All eight RS-232 slave ports will be wired as DTE ports. Refer
to Table 4 for pin out, signal name, and signal direction information.
Also, refer to Figure 5 for a simplified schematic showing the
relationship between the Master port and any RS-232 port "A-H".
Refer to Appendix B for cable charts.
Table 4. DTE PORTS A - H
Pin # Signal Description
RS-232
Signal
Direction of
DTE Ports A
through H
2 TD Transmit Data Output
3 RD Receive Data Input
4 RTS Request to Send Output
5 CTS Clear to Send Input
6* DSR Data Set Ready Input
7 SG Signal Ground <------>
8* CD Carrier Detect Input
20 DTR Data Term Ready Output
14** TD(B) Transmit (+) Output
15** TD(A) Transmit (-) Output
16** RD(B) Receive (+) Input
17** RD(A) Receive (-) Input
*Pins 6 & 8 are tied together inside the 232D4SS8 and share the
same input. Refer to Figure 5.
** RS-422/485 option if installed.