Rice Lake SCT-10 - Manual (Page 40)

36 SCT Weight Transmitter Operator’s Manual
N° BYTES: Number of bytes transmitted as a value of the registers (2
bytes per register)
VAL. REG.: Contents of the register beginning from the first.
The answer contains the register identification modified after the command has
been executed.
Communication Error Management
The communication strings are controlled by CRC (Cyclical Redundancy
Check).
In case of a communication error the slave will not respond with any string. The
master must allow for a time-out before response reception. If no response is
received it infers that a communication error has occurred.
In the event of a string received correctly but not executable, the slave responds
with an EXCEPTIONAL RESPONSE. The "FUNCTION" field is transmitted
with the MSB at 1.
List Of Usable Registers
The MODBUS-RTU protocol implemented on this instrument can manage a
maximum of 32 registers read and written in a single query or response.
R
= the register can be read only
W
= the register can be written only
R/W = the register can be both read and written
H
= high half of the DOUBLE WORD forming the number
L
= low half of the DOUBLE WORD forming the number
EXCEPTIONAL RESPONSE
Address Function Code 2 bytes
A Funct + 80h CRC
CODE DESCRIPTION
1 ILLEGAL FUNCTION (Function not valid or not supported)
2 ILLEGAL DATA ADDRESS (The specified data address is not available)
3 ILLEGAL DATA VALUE (The data received have no valid value)