SCANTECH ID (Champtek company) Discovery SG-20 - Manual (Page 30)

System Integration 22
INTERFACE SELECTION:
1. At the original Discovery with P/N A360102 the jumper setting for RS-232
interface must be:
The jumper location is described in chapter 4.2.
2. At the Discovery with P/N from A360104 and higher, the interface selection
is done electronically and can simply be carried out by using the 4 buttons of
the Discovery. See page 38 “terminal configuration Using 4 buttons”.
4.1.2 Direct RS-422 connection (single unit)
The Discovery terminal is linked to the Back Office by means of a Separator
Box, converting the Back Office RS-232 signal into an RS-422 signal, bridging a
physical distance of maximum 1200 meter. The box also provides electrical
isolation to prevent communication ports to be damaged due to ground
potential differences. The RS-422 cable will be supplied and installed by the
Scantech Distributor. See Appendix A for the cable specifications. For test and
demo purposes a short RS-422 cable is available at Scantech under P/N
A351701.