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7.4 Maintenance Mode Setup and Operation
The maintenance switch on the front of the base unit can switch between two maintenance
modes, maintenance mode 1 (MNT1) and maintenance mode 2 (MNT2).
There are three maintenance modes in total,
maintenance mode 1 (MNT1), maintenance mode 2
(MNT2), plus host maintenance mode.
The operation of the host maintenance mode is the same as maintenance mode 1.
For the setup and operation for maintenance modes 1/2, refer to 7-5 “Operation –
Maintenance Mode” of the PS-7-M series gas detector’s instruction manual.
The host maintenance mode can be turned on/off from the master by setting the test mode
register to on/off via Modbus communication
.
“MNT1” or “MNT2” appears on the LCD while in maintenance mode, and “MNT1” appears while
in host maintenance mode.
The host maintenance mode will automatically turn off 10 minutes later.
Register for host maintenance mode setting
Register name
Register
address
Data type
Data contents
Host maintenance
mode on/off
40050
Word
Set host maintenance mode to on/off
OFF: 0x0000
ON: 0x0001 (without self-resetting)
ON: 0x0011 (with 10-min self-resetting)
The master can check the current maintenance mode status by reading the device status information
at register address 40516.
The device status information (register address: 40516) is one word consisting of two bytes, Status
byte 1 (high-order byte) and Status byte 2 (low-order byte).
The maintenance mode is assigned to bits 0, 1 and 4 of Status byte 2 as shown in the following
table.
NOTE