SCANTECH ID (Champtek company) Discovery SG-20 User Manual

Page 36

System Integration

JUMPER SETTINGS RS-485

for all terminals, except the last one

See interface selection point 2.

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.

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.