Black Box IC107A-R3 Appendix Pinouts, Table A-1. Pinning of the RS-232 connector DB25 female

APPENDIX: Pinouts

Appendix: Pinouts

Table A-1. Pinning of the RS-232 connector (DB25 female).

Pin Number and Signal	Function
Pin1 — Frame Ground	Connects the Converter’s frame ground to the
	frame ground of the RS-232 device.
Pin 2 — TD	When the Converter is set to DCE, data is received
	on Pin 2 and the TX LED lights up when Pin 2 is a
	“space” (logical zero). When the Converter is set
	for DTE, data is output on Pin 2, in which case the
	RX LED lights up when Pin 2 is a “space.”
Pin 3 — RD	When the Converter is set for DCE, data is output
	on Pin 3. The RX LED lights up when Pin 3 is a
	“space.” When the converter is set for DTE, data is
	received on Pin 3 and the TX LED lights up when
	Pin 3 is a “space.”
Pin 4 — RTS	When the Converter is set for DCE, RTS is an input
	which turns on the RS-422/485 driver when true.
	When the Converter is set for DTE, RTS is always
	an output and is always true. (In DTE mode, CD
	controls the RS-422/485 driver.)
Pin 5 — CTS	When the Converter is set for DCE, CTS is an
	output that follows the RTS/DTR input. When the
	converter is set for DTE, CTS is not used.
Pin 6 — DSR	When the Converter is set for DCE, DSR is true.
	When the Converter is set for DTE, DSR is not
	used.
Pin 7 — Signal Ground	Connects the signal ground of the Converter to the
	signal ground of the RS-232 device.
Pin 8 — CD	When the Converter is configured DCE, CD is
	always true (and RTS controls the RS-422/485
	driver). When the Converter is set for DTE, CD is
	an input which turns on the RS-422/485 driver
	when true.
Pin 20 — DTR	When the Converter is set for DTE, Pin 20 is true.

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