Keypad Does Not Respond; Lcd Shows Keys Locked; After Silencing Alarm, Warning Or Trouble; Power Failure - Macurco DVP-120C User Instructions

Macurco DVP-120C Manual

6.5 Keypad does not respond

6.5.1 LCD shows KEYS LOCKED

The keypad can be unlocked by holding the zero (0) key for 3 seconds. At this time the backlight will turn on and the
display will return to normal mode. The keypad can again be locked by holding the zero key for 3 seconds until the
display shows KEYS LOCKED.

6.5.2 After silencing 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.

6.6 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.

6.7 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.

6.7.1 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.

6.7.2 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.

6.7.3 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.
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