
ACCESSORY NOTE
GRE A
MERICA
, Inc. 425 Harbor Blvd. Belmont, California 94002 USA phone (650) 591-1400 fax (650) 591-2001
INSTRUCTIONS
FOR
EIA 422 / RS-232 FULL DUPLEX CONVERTER
12-4002
1) The Converter receives its power from the DSR Pin (DB9-6) on the DB-9 connector from GINA. Check
to see that this pin is active with a 12 VDC output.
2) Plug the Converter into the GINA EIA/RS232 DB9 connector.
3) The EIA/RS422 connector is a European style with screw terminals. The identification label indicates
transmit (output from GINA) (1 & 2), receive (input to GINA) (3&4) and polarity. If a shielded cable is
used, the shield can be connected to ground (5). Pin 6 is not used.
4) The EIA/RS422 cable must consist of individual twisted pairs of #24 or #26 AWG wire. The transmit and
receive signals are assigned to be ± 5V balanced into 100 Ohms. (However, these lines are not
terminated.)
5) If Data is "Scrambled” or otherwise distorted, change the polarity of a twisted pair. (The correct polarity
is very important.)