M - 5
8. Command Format
The following formats are used to SEND commands by computer and RETURNED by
device.
8.1. Read Multiple Register (03 or 04)
Send to device Command string format:
DATA
DEVICE
ADDRESS
FUNCTION CODE
03 or 04
STARTING REGISTER NUMBER OF REGISTERS
CRC
1 BYTE
hh
1 BYTE
03
HB
00
LB
hh
HB
00
LB
hh
LB
hh
HB
hh
Returned by device Command string format:
DATA
DEVICE
ADDRESS
FUNCTION
CODE
03 or 04
NUMBER OF
BYTES
First REGISTER …… n REGISTERS
CRC
1 BYTE
hh
1 BYTE
03
1 BYTE
hh
HB
hh
LB
hh
…..
HB
hh
LB
hh
LB
hh
HB
hh
Where: HB – High Order Byte
LB – Lower Order Byte
Unused bits are set to zero
hh : Hex. Numbers
To Next Page
Loading...
Need help?
General
