Black Box IC171C manual EIA-530 SIO-485

RS422/485 SERIAL INTERFACE PLUS

DIP shunt E4 selects the pin out for the DB25 connector P3. With the

5-position shunt in the EIA-530 mode, the RS422/485 Serial Interface Plus complies with the EIA-530 pinout with the following signals supported:

Signal		Name	Pin #	Mode
GND		Ground	7
RDB	RX+	Receive Positive	16	Input RS-422
RDA	RX	Receive Negative	3	Input RS-422
CTSB	CTS+	Clear To Send Positive	13	Input RS-422
CTSA	CTS-	Clear To Send Negative	5	Input RS-422
DSRB	DSR+	Data Set Ready Positive	22	Input RS-422
DSRA	DSR-	Data Set Ready Negative	6	Input RS-422
DCDB	DCD+	Data Carrier Detect Positive	10	Input RS-422
DCDA	DCD-	Data Carrier Detect Negative	8	Input RS-422
TDB	TX+	Transmit Positive	14	Output RS-422
TDA	TX-	Transmit Negative	2	Output RS-422
RTSB	RTS+	Request To Send Positive	19	Output RS-422
RTSA	RTS-	Request To Send Negative	4	Output RS-422
DTRB	DTR+	Data Terminal Ready Positive	23	Output RS-422
DTRA	DTR-	Data Terminal Ready Negative	20	Output RS-422

EIA-530 SIO-485

Figure 4-10. DIP Shunt E4 (SIO-485 Mode).

With the 5-position shunt in the SIO-485 mode, the RS422/485 Serial Interface Plus converts to 4-wire or 2-wire RS-422/485 with the following signals supported:

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