MSA ZGARD CX II, Instruction Manual

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Section 6
ZGARD CX II Controller
Serial I/O Feature & Operation
The ZGARD CX II controller is capable of
communicating to an external control or monitoring
system using either BACnet MS/TP or MODBUS.
A plug-in communication board is required to
enable this external communication feature. This
board may or may not be factory installed
depending on what model was ordered. A
communication board is available to handle
MODBUS RTU or ASCII while a separate
communication board is available to handle BACnet
MS/TP. Both protocols utilize RS-485 as their bus
topology. RS-485 Port #4 on the main board of the
CX-II is used for either MODBUS or BACnet.
MODBUS (RTU & ASCII): All MODBUS registers
are read-only and are intended for remote
monitoring purposes only. Writing to a register is
not permitted. Only MODBUS function 03 (Read
Holding Register 4xxxx) is supported with a
maximum of 60 registers per read.
MODBUS Register Table:
40000
– 40009: Sensor 1
40010
– 40019: Sensor 2
40020
– 40029: Sensor 3
Etc…
40980
– 40989: Sensor 99
41100
– 41104: Zone 1
41105
– 41109: Zone 2
Etc…
41135
– 41139: Zone 8
42000: Relay 1
42001: Relay 2
Etc…
42039: Relay 40
The following data is available for each SENSOR :
40xx0: Enable State/Gas ID
(0=Disabled, 1...99=GasID)
40xx1: Status
(0=OK, 1=Fail, 2=Caution,
4=Warning, 8=Alarm)
40xx2: Zone Assignment (1...8)
40xx3: Sensor Port (1...4)
40xx4: Sensor Range (0...65535)
40xx5: Sensor Gas Value (0...65535)
40xx6: Caution Setpoint (0...65535)
40xx7: War
ning Setpoint (0…65535)
40xx8: Alarm Setpoint (0...65535)
40xx9: Not Used
The following data is available for each
ZONE :
411x0/x5: High Select Value (0-100%FS)
411x1/x6: Status
(0=OK, 1=Fail, 2=Caution,
4=Warning, 8=Alarm)
411x2/x7: No. Sensors (0..99)
411x3/x8: Not Used
411x4/x9: Not Used
The following data is available for each
RELAY :
420xx: Status (0=De-Activated,1=Activated)
MODBUS Type & Framing : Both ASCII and RTU
types of MODBUS are supported by the CX-II
controller. The type is selectable by a DIP Switch
on the back of the MODBUS communication board
(see page 9.7). The framing is slightly different for
the two types:
MODBUS ASCII: 7 Data, 1 Stop, Even Parity
MODBUS RTU: 8 Data, 1 Stop, No Parity
MODBUS Baud Rate : The MODBUS baud rate is
selectable from the configuration menu (see page
9.7). Available choices are: 9600, 19200, 38400,
57600 and 115200 BAUD.
MODBUS Address : The MODBUS slave address
is selectable from 1-127 in the configuration menu
as well (see page 9.7).
6.0