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6.6 The Keypad does not respond after silencing an Alarm, Warning or Trouble.
LCD continues to show the alarm, warning or trouble message.
It is possible that the horn or strobe have been configured to respond in alarm, warning or trouble conditions, even though there is no
horn or strobe connected (or perhaps they are used for some purpose that is not audible or visible). First, hold the HUSH key for five
seconds, or until the display changes to "ALARM silenced for 5 minutes" or another relevant message. Second, use the configuration
menu to disable the horn or strobe, if they are not being used for some other purpose.
6.7 After a power failure
After any power failure, the user should check the system clock. While system parameters are maintained in memory, the system clock
is backed-up by a limited-capacity button cell battery.
6.8 MRS-485 Modbus Application
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 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.
6.8.1
Normal Operation
1. When the LED is solid GREEN, the 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.
2. When the LED is GREEN with random bursts of AMBER, the 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.
6.8.2
Unknown Sensor Code
GREEN/OFF Alternating every 500 milliseconds - The MRS-485 doesn't know the detector type, no MODBUS communication is 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.
6.8.3
Error Codes
Solid RED - The MRS-485 detected an error and no MODBUS communications are in progress.
RED with random bursts of AMBER - The MRS-485 detected an error and AMBER is displayed when data are received or transmitted
over the RS-485 line.
There are a number of conditions which are signalized in this way:
1. Current EEPROM Settings not initialized
2. Current EEPROM Settings have a bad checksum
3. Factory EEPROM Settings not initialized
4. Factory EEPROM Settings have a bad checksum
5. Unknown Sensor exponent value
6. Watchdog Reset
7. Loaded Factory EEPROM Settings in EEPROM Current Settings
8. Latched sensor type different than registered sensor type
9. Unknown sensor type because registration failed
6.8.4
Dip Switch Settings Codes
RED/GREEN
Alternating every 200 milliseconds indicates that MRS-485 is in programming mode and waiting for the user to enter
new settings using the 8 switches.
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