LAUREL LTE Series - 5.0 Supported Exception Response Codes; 6.0 Message Formatting

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5.0 SUPPORTED EXCEPTION RESPONSE CODES
Code Name Error Description
---- -------------------- ------------------------------------------------------
01 Illegal Function Illegal Function Code for this Slave. Only hex Function
Codes 03, 04, 05, 08, 10 (dec 16) are allowed.
02 Illegal Data Address Illegal Register Address for this Slave.
03 Illegal Data Value Illegal data value or data length for the Modbus protocol.
04 Slave Device Failure Slave device failure (eg. Transmitter set for external gate).
6.0 MESSAGE FORMATTING
MA = Meter Address DD = Data (Hex) CL = CRC Lo Byte
FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte
RA = Register Address SF = Sub-Function CR = Carriage Return
NR = Number of Registers EC = Error Code LF = Line Feed
NB = Number of bytes LRC = ASCII Checksum
Modbus RTU Format
FC
Action
> 3.5
Char
Byte Number
1
2
3
4
5
6
7
8
9
10
11
03
03
Request
Response
NoTx
NoTx
MA
MA
FC
FC
RA
NB
RA
DD*
NR
DD*
NR
CL
CL
CH
CH
04
04
Request
Response
NoTx
NoTx
MA
MA
FC
FC
RA
NB
RA
DD*
NR
DD*
NR
CL
CL
CH
CH
05
05
Request
Response
NoTx
NoTx
MA
MA
FC
FC
RA
RA
RA
RA
WW
WW
WW
WW
CL
CL
CH
CH
08
08
Request
Response
NoTx
NoTx
MA
MA
FC
FC
SF
SF
SF
SF
WW
DD
WW
DD
CL
CL
CH
CH
10
10
Request
Response
NoTx
NoTx
MA
MA
FC
FC
RA
RA
RA
RA
NR
NR
NR
NR
NB
CL
DD*
CH
DD*
CL
CH
Exception
Response
NoTx
MA
FC
+80
EC
CL
CH
DD* = (DD DD) times NR (Number of Registers)