Specifications

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 10 63
B.3.20. Service Mode Register 0x001B (27 Dec) (W, 10 Bytes)
Variable Type Length Description
Rel_Svc_Mode * * See description of STATUS REGISTER
B.3.21. Release Service Mode 0x001C (28 Dec) (W, 10 Bytes)
Variable Type Length Description
Ent Svc_Mode * * See description of STATUS REGISTER
B.3.22. MZ Service Mode
The MZ monitor can be placed into service mode if necessary. During service mode the unit will take no
measurements, any and all alarms are silenced, and all relays are opened. The unit automatically comes
out of service mode after a preset interval defined by the service_mode_TO parameter in the System Data
Register.
Placing the unit into Service Mode:
1. Read the MZ Status Register (0x0011h)
2. Modify the content of the status register structure to change the MODE parameter to service
mode.
3. Send this updated status register structure back to the MZ unit using PRESET MULTIPLE
REGISTER COMMAND to the SERVICE MODE REGISTER (0x001Bh).
Releasing the unit from Service Mode:
1. Read the MZ Status Register (0x0011h)
2. Modify the content of the status register to change the MODE parameter to normal mode.
3. Send this updated status register structure back to the MZ unit using PRESET MULTIPLE
REGISTER COMMAND to the RELEASE SERVICE MODE REGISTER (0x001Ch).
B.3.23. PPM Register 0x001E (30 Dec) (R, 32 Bytes)
Variable Type Length Description
PPM UI 32 bytes
16 Unsigned Integers that represent the PPM values for each MZ monitor
zone
NOTE: 16 values are returned independent of the number of actual zones installed in the
unit. The master device is required to know how many zones are installed in the unit
(available in the System Register) in order to properly interpret the data.
B.3.24. Zone Log Registers 0x3xyy (R, 1502 Bytes)
These registers are used to transfer the zone log data. Each zone has a circular log of 100 past data points.
The period between data points is defined by the Log Interval parameter in each corresponding Zone Data
Register. The data for each zone is defined by the “x” place in the above register address. For zone 1 the
Register address is 0x30yyh, for zone 2 the register address is 0x31yyh, etc. The data for each zone is sent
in 8 consecutive registers due to MODBUS RTU message length constrains. The addresses are defined by
the “yy” place in the above address. For zone 1, all log data can be obtained by reading 0x3000h, 0x3001h,
0x3002h, …… , 0x3007h. The first seven registers contain 200 bytes each and the last register contains
102 bytes. After all registers have been received the data should be reassembled into the full data
structure.