Black Box RS0232 manual RS-232 ↔ RS-422 Signal Flow Diagram

RS-232↔RS-422 INTERFACE CONVERTER

RS-232 ↔ RS-422 Signal Flow Diagram

(Arrows indicate the direction of signal flow.)

RS-232							RS-422
(Port is DTE)							(Port is DCE)
TD	2	CR6	(RS-422 DATA LED)	SW1 A			Send Data A (-)
					4
					22		Send Data B (+)
				SW1 B
RD	3	CR7	(RS-232 DATA LED)			6	Receive Data A (-)
						24	Receive Data B (+)
		CR5	(RS-422 CTS LED)
RTS	4					7	Request to Send A (-)
						25	Request to Send B (+)

CR4 (RS-232 CTS LED)

CTS 5

CR9 (RS-232 DSR LED)

DSR 6

CD 8

TXC 15

RXC 17

9Clear to Send A (-)

27 Clear to Send B (+)

11Data Mode A (-)

29 Data Mode B (+)

13Receiver Ready A (-)

31 Receiver Ready B (+)

5Send Timing A (-)

23 Send Timing B (+)

8Receive Timing A (-)

26 Receive Timing B (+)

DTR	20		CR8	(RS-422 DSR LED)			12	Terminal Ready A (-)
							30	Terminal Ready B (+)
ETXC	24						17	Terminal Timing A (-)
							35 Terminal Timing B (+)
Chassis
		1				1	Chassis or Frame
GND								GND		GND
					Optional Jumper *
Signal									19	Signal GND
		7							20	Receive Common
GND
									37	Transmit Common

* Note: The optional jumper is removed (factory default

Figure 3-5. Signal Flow Diagram A.

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