B&B Electronics Buffered Smart Switch Pins 6, 8, & 20 looped back internally on the 232BSS4

Chart B.3. DCE (Modem) DB25 Connector to Master Port

DCE (Modem)		Signal	232BSS4
Serial Port			Master Port (DCE)
DB25 Connector	Direction		DB25 Connector
2	<-----------		3
			(RD)
3	-----------	>	2
			(TD)
4	<-----------		5
			(CTS)
5	-----------	>	4
			(RTS)
6	-----------	>	20
			(DTR) *
7	<	--------->	7
			(GND)
20	<-----------		6
			(DSR) *

•- Pins 6, 8, & 20 looped back internally on the 232BSS4

Chart B.4. DCE (Modem) DB9 Connector to Master Port

	DCE (Modem)	Signal			232BSS4
	Serial Port				Master Port (DCE)
	DB9 Connector	Direction			DB25 Connector
	2	-----------	>		2
					(TD)
	3	<-----------			3
					(RD)
	4	<-----------			6
					(DSR) *
	5	<---------	>		7
					(GND)
	6	-----------	>		20
					(DTR) *
	7	<-----------			5
					(CTS)
	8	-----------	>		4
					(RTS)
Documentation Number 232BSS42907 Manual				Appendix B: Cable Charts		B-3

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 Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445