Black Box IC470A - Making an RS-422 or RS-530 Connection to a DB25 (IC471 A and IC472 A Models)

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CHAPTER 4: Installation
For models whose RS-232 and RS-422/530 connectors
are both DB25 male (IC472A-M) or DB25 female
(IC471A-F), the connector farthest from the DTE/DCE
switch is the RS-422/530 connector.
4.1.1 M AKING AN RS-422 OR RS-530 C ONNECTION TO A DB25
(IC471A
AND IC472A M ODELS )
The IC471A and IC472A models of the Converter have
DB25 female and DB25 male RS-422/530 connectors
respectively. These are pinned according to RS-530,
although only the transmit- and receive-data signals are
supported. When you run cable from the Converter to
another RS-422 or RS-530 device, make sure the cable is
pinned as shown below, with the XMT→RCV wires in
one pair and the RCV←XMT wires in another pair:
RS-530 DB25 RS-422 RS-422 DB25 RS-530
Signal Pin Signal Signal Pin Signal
TD A 2 XMT+ ...................RCV A+ 3 RD A
TD B 14 XMT– ...................RCV B– 16 RD B
RD A 3 RCV+ ...................XMT A+ 2 TD A
RD B 16 RCV–.....................XMT– 14 TD B
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