Macurco MRS-485 Modbus RS-485 Adapter
REV – 1.0
[34-2900-0019-7]
24
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P a g e
8
Testing
The Macurco BRS-485 adapter converts the 4-20mA analog signal from Macurco 6-Series type detectors to a
digital signal for use with multipoint addressable systems. The 6-Series test procedures may be used to ensure
that the BRS-485 accepts the 4-20mA output for communications. All 6-Series detectors are factory calibrated
and 100% tested for proper operation. The units also perform a regular automatic self-test during normal
operation. If the unit detects an improper voltage or inoperable component, it will default into Error mode. In
this error mode, the Fan and Alarm relays will be activated, the 4-20 mA output will go to 24 mA, the unit will
display the error code and the buzzer will chirp intermittently.
8.1
Operation Test
Normally this will be the only test required for the 6-Series detectors and is the recommended way to test the
unit or units after installation. Check that the detector operating LED light is illuminated Green continuously. If
not, do not proceed with the tests. If the unit is in error mode, contact your local representative or Macurco
technical service representative for information on resolving the problem.
1.
Remove the single screw in the middle of the front cover of the 6-Series detector.
2.
Remove the front cover.
3.
Observe the LED light on the front of the 6-Series detectors.
4.
If the light is solid green, proceed to step 6.
5.
If the light is off or flashing Green, refer to the Section 5.3 Normal Operation above.
6.
Locate the switch labeled ENTER/TEST on the left side of the printed circuit board. Press the Test switch
once.
7.
The 6-Series detector will step through a cycle test:
a.
The display progresses through the bUZ (buzzer Test) Art (alarm relay test), Frt (fan relay test)
then 42t (4-20 mA output test).
b.
Make sure that the settings are “on” and not disabled “diS”.
c.
During the first 10 seconds of the test cycle, the display will show “bUZ” and set off the audible
buzzer.
d.
The alarm relay will be closed, so any devices connected to that relay will be tested.
