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

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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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Contents RS-232↔RS-422/485 Converter Data Only European Union Declaration of Conformity RS-232↔RS-422/485 Converter Data only NOM STATEMENT, Trademarks Contents Specifications User ControlsMtbf Wire full-duplex point-to-point application IntroductionConfiguration Configuration Installation DeviceOperation RS-232 CircuitryBlock diagram of Converter functions in DCE mode RS-422/485 Circuitry Troubleshooting Calling Black BoxTable A-1. Pinning of the RS-232 connector DB25 female Appendix PinoutsTable A-2. Pinning of the RS-422/485 connector Page Page Copyright 2001. Black Box Corporation. All rights reserved