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485DSS-0308 
Manual 
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 
B&B Electronics  – Westlink Commercial  Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445
 
 
Specifications 
Model:   
485DSS 
Size:   
 
 
4.8"L x 2.15"W x 0.9"H 
Power:   
 
 
+11 to 16 Vdc 75mA 
RS-232 Connection:   DB-25 male (DTE configured) 
RS-485 Connection:    Terminal Blocks 
Communications: 
9600 baud, no parity, 8 data bits, 1 stop bit 
 
Figure 2. Top View of Circuit Board 
 
Port Configuration 
The 485DSS has a RS-485/422 port and a RS-232 port. The 
RS-485/422 signals are on terminal blocks. Table 1 shows you the 
pinouts and Figure 2 shows you the location of the terminal blocks.  
The RS-232 signal, in the DTE configuration, connects to a DB25 
male connector. Table 2 shows you the RS-232 pinouts.    
RS-485/422 Port 
 
The RS-485 port on the 485DSS receives and transmits data to 
and from the RS-485 network. The RS-485 port has a balanced 
differential line driver and receiver. RS-485 allows up to 32 driver 
and receiver pairs to share a two-wire party line network.  This port 
will operate on a 4-wire network and is compatible with RS-422 
devices. Refer to B&B Electronics’ free RS-422/485 Application Note 
for more information.  Refer to Appendix C for cable charts.