Technical Manual CODEL
31
Appendix 1: MODBUS Communication & RS485 Connection
The MODBUS protocol output of the Tunnel Tech (TT) 700 Series AQM is taken via the 4-way plug.
RS485 connection is also available and the following wiring schematic and photograph illustrate the
connections for this feature.
All instruments will be supplied with a 4-way black plastic plug. Connections in the plug are as follows:
Note that in the plug, terminal 1 must be linked to terminal 3 and terminal must be linked to
terminal 2. If no comms. are present first check the address switch setting and if this does not cure
the problem swap the polarity of TRx lines + and -.
Optional Extra
Diagnostic & Commissioning tool
Illustrated is the serial USB-RS485 interface
(complete with pc software drivers & cable)
supplied by CODEL for temporary connection
to the AQM during commissioning and
diagnostic communications.
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