Specifications

Multi-Zone Gas Monitors

P/N: 3015-5074 Rev 10 57

Parameter Description

Stop Bits Default is 1. Can be set for 2 via System data register.

Maximum Response Time

4000 ms when directly accessing the MZ monitor.

8,000 ms when accessing the MZ monitor through the RD.

Error Checking CRC per MODBUS specifications

NOTE: All data sent out from the MZ is in “little endian” byte order (Least significant byte

followed by most significant byte). This should be taken into account if the master that

process the data is a “big endian” type. Non-data information (starting address, number of

points, etc.) follows normal MODBUS protocol, which is Big Endian.

B.3.6. Summary of Registers

Name Number

HEX Decimal Description

System Data 0x0010 16 R/W System Setup Data

Status 0x0011 17 R/W Operating summary of faults, alarms and status

Zone Data 0x12xx 4609-4630 R/W Setup data for up to 16 zones (xx defines zone number)

CAL Data 0x0014 20 R/W Cal Factors for all gases

Date/Time 0x0015 21 R/W Set MZ date & time

Sensor Data 0x0016 22 R Raw measurement of sensors

Rel. Hold 0x0017 23 W Release MZ out of hold mode

Hold Zone 0x0018 24 W Put MZ into hold mode

Fault Log 0x19xx 6400-6401 R 20 most recent fault events (xx = 00 or 01)

Flow Log 0x001F 31 R 20 most recent flow fault events

Alarm Log 0x1Axx 6656-6658 R 20 most recent alarm events (xx = 00, 01, or 02)

Serv. Mode 0x001B 27 W Puts MZ into service mode

Rel Serv. 0x001C 28 W Release MZ from service mode

PPM 0x001E 30 R PPM values for all zones

Zone Log 0x3yxx 0-6

Trend data for each MZ zone [y = zone # (starting at 0), xx = 00 – 06]

Data

Data Type Abbreviations

C Character

Float Floating Point

I Integer

TIM Time

UI Unsigned Integer