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Appendices
Appendix F – Using the ADAM-4520 in RS-422 and RS-485
Communication
The following examples show how three TouchStar Mini devices are connected in daisy chain using
RS422 first and RS485 next. The connection makes use of T-Junction boxes (JB-422). Please consult
your dealer for the acquisition of the junction boxes.
The following diagram shows a schematic layout of the connection. Appendix E can be referred to for a
pin-out description for the RS-422 or RS-485 signals at the ADAM. ADAM configurations are also
described in Appendix E.
Note that the placement of terminating resistors at the ADAM and at the last T-Junction box depends on
actual testing. For the TouchStar devices communicating in RS-485, terminating resistors are usually
not needed. This has been tested by the manufacturer.
ADAM Interface Converter
RS232 to RS422 / RS485
T-Junction Box
(JB1)
T-Junction Box
(JB2)
T-Junction Box
(JB3)
Host PC
TouchStar #1
TouchStar #2
TouchStar #3
TouchStar devices in RS422 or RS485
T-Junction Box:
The diagram below shows a schematic layout of the T-Junction box. There are three main sections for
the pin-outs, namely ‘IN’, ‘OUT’ and ‘DAISY CHAIN’. Each pin number of a section is internally shorted
to the similar pin number of the other two sections.
CN2
1
2
3
4
3
4
1
IN
2
3
DAISY CHAIN
4
OUT
CN1
1
2
Layout of T-Junction Box
If this is the first T-Junction box from the ADAM, the RS-422 or RS-485 signals go into the ‘IN’ section.
The signals from the ‘OUT’ section go into the TouchStar unit. And the signals from the ‘DAISY CHAIN’
section go into the next T-Junction box.
The recommended colors of the wires to use are also shown in the diagrams that follows.
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