MatrixMonitor™ IOM - Rev 4 - 4/11/2013
Page 72
Abs.
Modbus®
Address Register Operation
Data Description
Units/Notes .
149
40150 R/W
Array 1 Fan 1 Status
Status Codes
150
40151 R/W
Array 1 Fan 2 Status
[Low Byte]
Bit 0: 1=Fan Failed
.
R/W
.
Bit 1: 1= Fan In Surge
.
R/W
.
Bit 2: 1=Vibration Warning
.
R/W
.
Bit 3: 1=Fan is Backflowing
.
R/W
.
Bit 4: 1=Sensor Board not
responding
.
R/W
.
Bit 5: Not Used
197
40198 R/W
Array 1 Fan 49 Status
Bit 6: Not Used
Bit 7: Not Used
198
40199 R/W
Array 2 Fan 1 Status
[High Byte]
Bit 0:0= Fan Enabled 1=Fan
Disabled
199
40200 R/W
Array 2 Fan 2 Status
Bit 1: 1=Blank Off Plate Installed
.
R/W
.
Bit 2: Not Used
.
R/W
.
Bit 3: Not Used
.
R/W
.
Bit 4: Not Used
.
R/W
.
Bit 5: Not Used
.
R/W
.
Bit 6: Not Used
246
40247 R/W
Array 2 Fan 49 Status
Bit 7: Not Used
Note: Any write operations to the fan
status registers will only affect the high
byte. Data in the low byte will be ignored.
Communication Data:
Default Communication Settings
User Selectable Options
Baud Rate:
19,200
{9,600, 19,200, 38,400 and 57,600 Baud rates are selectable}
Data Bits:
8
8 Data Bits are required by Modbus® RTU
Parity:
Even
{Odd and No Parity are selectable}
Stop Bits:
1
{2 stop bits are used if No Parity is selected as required by Modbus®
RTU}
Factory Default Address: 75
{User selectable from 1 to 247}
Notes:
1. Only Modbus® RTU is supported
2. All Modbus® registers are HOLDING registers
3. Only one register can be read or written to at a time
4. If a Modbus® command is sent to read or write multiple registers, an error will be returned
5. For information about the Modbus® protocol, visit www.modbus.org
Supported Commands
03(03h) Read Holding Register (only reads 1 register per command)
06(06h) Write Single Register
The Physical Layer for MatrixMonitor™ Modbus® communication to the Building Management System (BMS) is
via EIA/TIA‐485 (RS‐485) two wire multipoint system. The MatrixMonitor™ is configured as a "slave" and will
respond to messages sent by a "master" over this line.
