Allen-Bradley PLC-5 User Manual page 157

This Field Specifies
Diagnostic file The file containing the channel's
status information
Enable Whether the remote mode change
option is enabled
Mode attention char. The attention character for the system
or the user mode character for remote
change
System mode char. The character to be used with the
mode attention character (above)
User mode char. The character for the mode attention
character (above)
Serial Settings
Baud rate Communication rate for channel 0
Configure all devices in the system for
the same communication rate
Parity Parity setting for channel 0
Parity provides additional message
packet error detection.
Bits per character Select the number of bits that make up
a transmitted character.
Error detect Whether you want error detection set
to BCC or CRC
Communicating with Devices on a Serial Link
Configure by Doing the Following
Enter an integer file number (10-999).
ATTENTION: Assign a unique diagnostic file to each channel. Do not
assign a diagnostic file that is the I/O status file you assigned or any
other used integer file. Unpredictable machine operation can result.
Important: You must define a diagnostics file for a channel configured for
anything but unused (even if you are not using the channel) if you want to
get status information for that channel.
Select ENABLED.
Enter a character. If the attention character you want to use is a control
character, specify the ASCII equivalent.
Enter a character. If the attention character you want to use is a control
character, specify the ASCII equivalent.
When the controller encounters the attention character and the system
mode character, the controller sets channel 0 communication to system
mode. The remote mode change option must be ENABLED.
Enter a character. If the attention character you want to use is a control
character, specify the ASCII equivalent.
When the controller encounters the attention character and the user
mode character, the controller sets channel 0 communication to user
mode. The remote mode change option must be ENABLED.
Select 110, 300, 600, 1200, 2400, 4800, 9600, or 19.2k bps.
Select NONE or EVEN.
Select 7 or 8.
Select one of the following:
BCC: the controller sends and accepts messages that end with a BCC byte
for error checking. BCC is quicker and easier to implement in a computer
driver.
CRC: the controller sends and accepts messages with a 2-byte CRC for
error checking. CRC is more complete checking
Configure both stations to use the same type of error checking.
Publication 1785-UM012D-EN-P - July 2005
10-7