Db9 Connector; Testing And Commissioning - Procentec ComBricks User Manual

3.11.2 DB9 connector

The bottom channel (CH1) is additionally equipped with a DB9 connector to offer an alternative connector for
standard 9-pin PROFIBUS plugs (1-on-1 with the screw terminals).
When the DB9 connector is utilized and located at the end of the segment, it is recommended to use the
termination on the DB9 connector and NOT on the repeater module (see Fig. 25 - configuration C)

To connect the PROFIBUS cable to the repeater modules (screw terminals) a 2.5 mm screwdriver
(max. 0.4 mm) is required.

3.11.3 Testing and commissioning

If the channel recognizes valid PROFIBUS messages from 1 or more connected devices, the RX LED of this
channel should be blinking and ER should be OFF.
When the termination of a specific channels is set to ON, the SWx LED should be ON.
2
The plug is the best place to activate the termination! When you remove the connector from the module you
still have the termination in the plug which is attached to the bus cable. It is true that the termination is not
powered by 5V (which is always required), but better an unpowered termination than nothing at all.
ComBricks User Manual v6.4.0 | January 18| © PROCENTEC
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