General Monitors FL3100 - MODBUS Data Format; MODBUS Read Status Protocol

Models FL3100/3101
29
NOTE
*
-
Address 0 is reserved for broadcast mode and will not be supported at
this time.
NOTE
**
-
Start Address can be a maximum of 9999 Address Locations (0000-
270E)
8.3.2 MODBUS Read Response Message
Byte MODBUS Range Referenced to FL3100, FL31001
1
st
Slave Address
1-247
*
(Decimal)
FL3100, FL3101 ID (Address)
2
nd
Function Code 03 Read Holding Registers
3
rd
Byte Count 02 No. of Data Bytes
4
th
Data Hi 00-FF (Hex) FL3100, FL3101 Hi Byte Status
Data
5
th
Data Lo 00-FF (Hex) FL3100, FL3101 Lo Byte Status
Data
6
th
CRC Lo 00-FF (Hex) CRC Lo Byte
7
th
CRC Hi 00-FF (Hex) CRC Hi Byte
NOTE -
Address 0 is reserved for broadcast mode and will not be supported at
this time.
8.4 MODBUS Write Command Protocol (Query/Response)
8.4.1 MODBUS Write Query Message
Byte MODBUS Range Referenced to FL3100, FL3101
1
st
Slave Address
1-247
*
(Decimal)
FL3100, FL3101 ID (Address)
2
nd
Function Code 06 Preset Single Register
3
rd
Register Address
Hi
**
00 Not used by FL3100, FL3101
4
th
Register Address
Lo
**
00-FF (Hex) FL3100, FL3101 Commands
5
th
Preset Data Hi 00-FF (Hex) FL3100, FL3101 Hi Byte
Command Data
6
th
Preset Data Lo 00-FF (Hex) FL3100, FL3101 Lo Byte
Command Data
7
th
CRC Lo 00-FF (Hex) CRC Lo Byte
8
th
CRC Hi 00-FF (Hex) CRC Hi Byte
NOTE
*
-
Address 0 is reserved for broadcast mode and will not be supported at
this time.
NOTE
**
-
Register Address can be maximum of 9999 Address Locations (0000-
270E)