RMS Technologies ACC-03 RS485 TO RS232 CONVERTER CARD (ROHS) - Manual (Page 9)

Pinout differences:
Pin 1
Pin 1
Power Connector (Green):
Æ
(no change)
Pin Function
1 PWR
2 Ground
Pin Function
1 PWR
2 Ground
Communication Connector (White):
Æ
(change)
Pin Function
1 RS485 A (-)
2 GND
3 RS485 B (+)
Pin Function
1 PWR
2
GND
3 RS485 B (+)
4 RS485 A (-)
How to connect with old cable:
If you have a cable with a Red 4-Pin connector, simply cut off this connector,
strip the wires and reconnect to a 3-Pin connector in the following manner:
Old 4-Pin cable Connect
to
New 3-Pin cable
Pin # Color/function Color/function Pin #
Pin 1 Red (PWR) Æ No connection --
Pin 2 Green (GND) Æ Green (GND) Pin 2
Pin 3 Brown RS485 B (+) Æ Brown RS485 B (+) Pin 3
Pin 4 Black/white RS485 A (-) Æ Black/white RS485 A (-) Pin 1
Follow connection specifications as stated in this user manual, section 3.
RS485-232 Converter Card Page 9 3/20/2009