20-14
PPC Manual Revision 1
Chapter 20: Modbus Communication
08 Loopback test
Element
Message
start mark
(:)
Address No.
(ADR)
Function code
(0x08)
Diagnostic
code
(0000)
Send data
(arbitrary)
Error
check
Message
end mark
(CR+LF)
1 1 2 2 2
1 2 2 4 4 2 2
Element
Message
start mark
(:)
Address No.
(ADR)
Function code
(0x08)
Diagnostic
code
(0000)
Same as
send data
Error
check
Message
end mark
(CR+LF)
1 1 2 2 2
1 2 2 4 4 2 2