Typical Example of Message Format
To read all of the inputs on a 28 way annunciator on node 9 the user would use the following
message format
RTU
ADDRESS FUNCTION REGISTER ADDRESS No. of REGISTERS ERROR CHECK
09 03 00 00 00 1C 45 4B
ASCII
: ADDRESS FUNCTION REGISTER
ADDRESS
No. of
Registers
ERROR
CHECK
CR LF
3A 30 39 30 33 30 30 30 30 30 30 31 43 44 38 0D 0A
To read the alarm status of channel 2 on node 255 the user would use the following message
format
RTU
ADDRESS FUNCTION REGISTER ADDRESS No. of REGISTERS ERROR CHECK
FF 03 01 2D 00 01 00 21
ASCII
: ADDRESS FUNCTION REGISTER
ADDRESS
No. of
Registers
ERROR
CHECK
CR LF
3A 46 46 30 33 30 31 32 44 30 30 30 31 43 46 0D 0A
To read the alarm status of channel 2 on node 255 the user would use the following message
format
RTU
ADDRESS FUNCTION REGISTER ADDRESS No. of REGISTERS ERROR CHECK
01 03 01 01 00 01 D4 36
ASCII
: ADDRESS FUNCTION REGISTER
ADDRESS
No. of
Registers
ERROR
CHECK
CR LF
3A 31 31 30 33 30 31 30 31 30 30 30 31 46 39 0D 0A