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Macurco MRS-485 Modbus RS-485 Adapter
Figure 4-2 MRS-485 Front view
5
Operations
5.1
Power up
The Macurco 6-Series detector cycles through an internal self-test cycle for the first minute that it is powered.
The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure). During the self-
test cycle the unit will display the firmware version number, then count down from 60 to 0 (if the display setting
is "On") and finally go into normal operation. The alarm relay will be activated for 10 seconds and the fan relay
for 60 seconds during the power-up cycle unless the "Power Up Test" (PUt) option is OFF. The indicator light
(LED) will flash green during the self-test cycle. At the end of the 1-minute cycle, the unit will take its first sample
of the air and the indicator light will turn solid green.
The MRS-485 is an adapter which allows the reading of a 6-Series gas detector over a Modbus interface. To
achieve this, the MRS-485 will monitor the 4-20 mA current output of the detector. At power up and during its
warm-up period, the 6-Series detector will communicate its sensor type over the 4-20 current output using a
custom protocol. The MRS-485 will automatically register each 6-Series detector as it is programmed with
REV – 1.0
[34-2900-0019-8]
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P a g e
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