GF U1000 V2 - Modbus Error Messages

Troubleshooting Instruction manual
34
Error messages are displayed as a number in the diagnostics menu. Contact GF Support if
other messages appear.
Error meaning
Status Byte
Value
Bit#7
Bit#6
Bit#5
Bit#4
Bit#3
Bit#2
Bit#1
Bit#0
TOFM signal lost
1
8
TOFM board failed
1
16
TOFM windwo
failed
1
32
TOFM sensor type
failed
1
64
TOFM I2C failed
1
128
13.3 Modbus Error Messages
Test case
Transmitter
Address
Command
Start Register
Length (no of
registers)
CRC-16
[1 byte]
[1 byte]
[2 bytes]
[2 bytes]
[2 bytes]
No error
0x01
0x03
0x00
0x00
0x00
0x20
0x44
0x12
Incorrect function
request
0x01
0x0C
0x00
0x00
0x00
0x20
0x10
0x13
incorrect register
start
0x01
0x03
0x00
0xEF
0x00
0x20
0x75
0xE7
Incorrect register
length
0x01
0x03
0x00
0x12
0xFF
0x02
0x25
0xFE
slave is busy
0x01
0x03
0x00
0x00
0x00
0x20
0x44
0x12
incorrect CRC-16
0x01
0x03
0x00
0x20
0x00
0x20
0x44
0xFF