Macurco BRS-485, Инструкция пользователя

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Macurco MRS-485 Modbus RS-485 Adapter
REV – 1.0 [34-2900-0019-7] 20 | P a g e
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 BRS-485 is an adapter which allows the reading of a 6-Series gas detector over a RS-485 interface. To
achieve this, the BRS-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 BRS-485 will automatically register each 6-Series detector as it is programmed with
information about all the detectors to which it can be connected. The BRS-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 BRS-485.
5.3 Normal Operation
When the LED is solid GREEN, operation is normal, the BRS-485 knows the detector type, no errors are detected,
and no 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.