Bronkhorst Modbus slave interface - Manual (Page 21)

BRONKHORST ®
5 TROUBLESHOOTING
5.1 Visual diagnostics
LED indications (if present) can be very useful in case of problems with the instrument.
The green LED is normally used for instrument status indication, like normal operation or special function mode. The
red LED will burn continuously in case of a hardware failure. During normal operation, the red LED is switched on
during frame reception or sending on the Modbus interface.
5.2 Step-by-step
More information can be found in document 9.17.023 Operation instructions digital instruments.
This document can be found at:
http://www.bronkhorst.com/en/downloads/instruction_manuals/
START
Check Slave address and
baud rate
Check all Modbus settings at your master. Master and device settings must be the
same, check baud rate and parity setting.
Check slave address and baud rate of device (slave).
Check cabling and
termination Check cabling and bus termination of your Modbus system.
Check power supply
Check power supply. Instruments need +15Vdc or +24Vdc.
Ready
Check Master
Reset Try to reset the instrument and/or restart your master.
Check diagnostics
Check the bus diagnostics string. See below.
Page 21 Modbus interface 9.17.035