SCANTECH ID (Champtek company) Discovery SG-20 - Manual (Page 36)

System Integration 28
B. JUMPER SETTINGS RS-485
for all terminals, except the last one
See interface selection point 2.
C. INTERFACE SELECTION:
1. At the original Discovery with P/N A360102 the jumper setting for RS-485
interface must be: (for the last terminal in the network)
2. At the updated Discovery with P/N from A360106 onwards, the interface
selection is done electronically and can simply be carried out by using the
4 buttons of the Discovery. See Section 6 for more details.
D. TERMINAL ADDRESS
The Discovery terminal address in the network can be configured using the
buttons. See SG-20 Manual section 6. Make sure all Discoveries have a
different network address. Non-unique addressing will result in a communication
conflict. Valid addresses are 01, 02, 03 .. 32.
Installing the network box
The Network box (A361501) converts the RS232 signal from the back office
system into a signal suitable for 1 to 32 Discovery’s in RS485 mode.
The box separates the Discovery’s electrically from the back office system by
using optocouplers. This prevents from damage due to ground potential
differences.