Bradley Smoker PLC-5 user manual Serial Settings

Communicating with Devices on a Serial Link 10-7

This Field	Specifies	Configure by Doing the Following
Diagnostic file	The file containing the channel’s	Enter an integer file number (10-999).
	status information	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.
Enable	Whether the remote mode change	Select ENABLED.
	option is enabled

Mode attention char.	The attention character for the system
	or the user mode character for remote
	change

Enter a character. If the attention character you want to use is a control character, specify the ASCII equivalent.

System mode char.	The character to be used with the
	mode attention character (above)

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.

User mode char.	The character for the mode attention
	character (above)

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.

Serial Settings

Baud rate	Communication rate for channel 0	Select 110, 300, 600, 1200, 2400, 4800, 9600, or 19.2k bps.
	Configure all devices in the system for
	the same communication rate
Parity	Parity setting for channel 0	Select NONE or EVEN.
	Parity provides additional message
	packet error detection.
Bits per character	Select the number of bits that make up	Select 7 or 8.
	a transmitted character.

Error detect	Whether you want error detection set
	to BCC or CRC

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