12.2.7
Example COMMREQ Data Block for
Configuring Serial I/O Protocol
Values
Meaning
First 6 words
Reserved for COMMREQ use.
A 6
FFF0H
Command
A 7
005
Protocol: 0005=Serial IO
A 8
0 = Slave
Port Mode
A 9
4=4800, 5=9600, 6=19200, 7=
38400*, 8=57600**
Data Rate
*CPU models IC200CPU005
and CPUE05 only
A 10
0 = None, 1 = Odd, 2 = Even
Parity
A 11
0 = Hardware, 1 = None
Flow Control
A 12
0-255 (units of 10ms,e.g. 10=
100ms)
Turnaround Delay
A 13
0 = Long
Timeout
A 14
0=7 bits, 1=8 bits
Bits per Character
A 15
0 = 1 stop bit, 1 = 2 stop bits
Stop Bits
A 16
not used
Interface
A 17
0 = 2-wire, 1 = 4-wire
Duplex Mode
A 18–21
not used
Device Identifier
A 22*
0-255 (units of 10ms,e.g. 10=100ms)
Receive to transmit
delay
A 22*
0-255 (units of 10ms,e.g. 10=100ms)
RTS drop delay
Note
The data block length (A 0) for a COMMREQ that includes the Receive to
transmit delay and RTS drop delay should be 12H not 10H. Both forms (Length 10H and
12H) are supported.
Note
If Serial I/O is configured for 115.2K baud. a major error code 12 (0cH) and a
minor error code 2 (02H) is returned in the COMMREQ status word. This will occur for
any unsupported baud rate.
232
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