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Macurco MRS-485 Modbus RS-485 Adapter
information about all the detectors to which it can be connected. The MRS-485 will use this information to
determine the gas level sensed by the 6-Series detector by measuring the 4-20 mA current-loop output during
normal operation of the detector.
5.2
4-20mA Loop
The 4-20mA Loop must be enabled "ON", the 6-Series detector. If the 4-20mA loop has been disabled "OFF" the
6-series detector will not be able to send the signal information to the MRS-485 to be converted to Modbus
data.
5.3
Normal Operation
When the LED is solid GREEN, operation is normal, the MRS-485 knows the detector type, no errors are
detected, and no Modbus data are being received or transmitted over the RS-485 line.
When the LED is GREEN with random bursts of AMBER, operation is normal and now data are being received or
transmitted over the RS-485 line. The AMBER LED will come on anytime that there is data traffic.
6
Troubleshooting
6.1
On-Board Diagnostics
6.1.1
Unknown Sensor Code
GREEN/OFF Alternating every 500 milliseconds - The MRS-485 doesn't know the detector type, no Modbus
communications are in progress and no errors are detected.
To correct this condition:
1.
Disconnect the power line from the MRS-485.
2.
Disconnect the Modbus line from the MRS-485.
3.
Re-connect the Modbus Line to the MRS-485.
4.
Re-connect the power line to the MRS-485.
REV – 1.0
[34-2900-0019-8]
17 |
P a g e
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