Emerson PACSystems RX3i - Example COMMREQ Data Block for Configuring Serial I;O Protocol

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 140
Address + 19
Count of 100 µs units (0 = 3.5 character times)
End-of-frame timeout
73
Address + 20
not used
Address + 21
not used
Address + 22
Count of 10 ms units (range 0-255)
Receive-to-transmit delay
73
6.1.9 Example COMMREQ Data Block for Configuring Serial
I/O Protocol
Values
Meaning
Address
12
Data Block Length
Address + 1
0 = No Wait (WAIT mode not supported)
WAIT/NOWAIT Flag
Address + 2
0008 = %R, register memory
Status Word Pointer Memory
Type
Address + 3
Zero-based number that gives the address of the
COMMREQ status word (for example, a value of 99
gives an address of 100 for the status word)
Status Word Pointer Offset
Address + 4
not used
Idle Timeout Value
Address + 5
not used
Maximum Communication Time
Address + 6
FFF0H
Command Word (serial port
setup)
Address + 7
5 = Serial I/O
Protocol
Address + 8
not used
Port Mode
Address + 9
See COMMREQ Command Block Parameter Values.
Data Rate
Address + 10
0 = None, 1 = Odd, 2 = Even
Parity
Address + 11
0 = Hardware, 1 = None, 2 = Software
Flow Control
Address + 12
not used
Turnaround Delay
73
The End-of-frame timeout and Receive-to-transmit delay values were added in Release 6.70 for the RX3i. They are discussed in the RTU Slave
Protocol section.