Rice Lake Signal Conditioning Transmitter/Indicators - Manual (Page 52)

48 SCT Weight Transmitter Operator’s Manual
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 + 0x80 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)
REGISTER DESCRIPTION Saving to EEPROM ACCESS
40001 Firmware version - R
40002 Type of instrument - R
40003 Year of Production - R
40004 Serial Number - R
40005 Active program - R
40006 COMMAND REGISTER NO W
40007 STATUS REGISTER - R
40008 GROSS WEIGHT H - R
40009 GROSS WEIGHT L - R
40010 NET WEIGHT H - R
40011 NET WEIGHT L - R
40012 PEAK WEIGHT H - R
40013 PEAK WEIGHT L - R
40014 Divisions and Units of measure - R
40015 Coefficient H R
40016 Coefficient L R