Example Commreq Data Block For Configuring Rtu Protocol - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
6.1.8 Example COMMREQ Data Block for Configuring RTU
Protocol
Values
Address 13, or 17
Address + 1 0 = No Wait (WAIT mode not supported)
Address + 2 0008 = %R, register memory
Zero-based number that gives the address of the
Address + 3 COMMREQ status word (for example, a value of 99
gives an address of 100 for the status word)
Address + 4 not used
Address + 5 not used
Address + 6 FFF0H
Address + 7 3 = RTU
Address + 8 0 = Slave
Address + 9 See COMMREQ Command Block Parameter Values.
Address + 10 0 = None, 1 = Odd, 2 = Even
Address + 11 0 = Hardware, 1 = None
Address + 12 not used
Address + 13 not used
Address + 14 not used (RTU always chooses 8 bits by default)
Address + 15 not used (RTU always chooses 1 stop bit by default)
Address + 16 not used
Address + 17 0 = 2-wire, 1 = 4-wire, 2 = 4-wire transmitter always on Duplex Mode
Address + 18 Station Address (1-247)
Serial I/O, SNP & RTU Protocols
Meaning
Data Block Length
WAIT/NOWAIT Flag
Status Word Pointer Memory
Type
Status Word Pointer Offset
Idle Timeout Value
Maximum Communication Time
Command Word (serial port
setup)
Protocol
Port Mode
Data Rate
Parity
Flow Control
Turnaround delay
Timeout
Bits per Character
Stop Bits
Interface
Device Identifier
Section 6
October 2019
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