IDEMIA DOCUMENT
– REPRODUCTION AND DISCLOSURE PROHIBITED
RS-422 Communication
293732943-F
12
Step
three
:
c
omm
unic
at
ion
s
RS-232
from the
Com Port
RS-232 to RS-
422 converter
RS-422 to
1200m (4000ft)
RS422
17
R (A)
Blue / Black
15
RS422_RX- (B)
Blue / White
16
R / 485_TX/RX+ (Y)
Green / Black
18
RS422_TX- / 485_TX/RX- (Z)
Green / White
19
RS422/485_GND
Black / Red
For RS-422 installations, the cable should be run
in a point to point configuration (i.e. PC > converter
> terminal)
Choose one twisted pair of conductors to use for RS-
422 RX+(A) (Blue / Black wire) and RS-422 RX-(B)
(Blue / White wire).
Choose one twisted pair of conductors to use for RS-
422 TX+(Y) (Green / Black wire) and RS-422 TX-(Z)
(Green / White wire).
Another conductor should be used for Signal Ground
(Black / Red wire).
Use CAT-5 UTP (or better) cable (shielded recommended) with a impedance of 120
. AWG 24 should be the
minimum wire gauge used.
The maximum total cable length is 4000 ft. (1200m).
The cable must be dedicated to this installation and not used for any other purpose
