Bradley Smoker PLC-5 user manual 10-19

Communicating with Devices on a Serial Link 10-19

This Field Specifies Configure by Doing the Following

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

Enter a valid attention 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	Select one of the following:
	to BCC or CRC	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.
Stop bits	Match the number of stop bits to the	Select 1, 1.5, or 2.
	device with which you are
	communicating

Control line	Select the mode in which the driver
	operates.

Select a method appropriate for your system’s configuration:

If you are not using a modem, choose NO HANDSHAKING.

If you are using a full-duplex modem, choose FULL-DUPLEX.

Option Settings

RTS send delay	The time delay between the time the
	RTS is asserted and the beginning of
	the message transmission

Enter a value between 0 and 255. Limits are defined in 20 ms intervals. For example to wait 40 ms, type 2. The recommended time elapse is 0, unless you are using a modem that automatically returns the CTS as soon as it receives the RTS. If this is the case, enter a delay time to make sure the modem is able to transmit before it attempts to send the message.

RTS off-delay	The time delay between the time the
	end of the message transmission and
	the RTS is de-asserted

Enter a value between 0 and 255. Limits are defined in 20 ms intervals. For example to wait 40 ms, type 2. The recommended time elapse is 0, unless you are using a modem that automatically returns the CTS as soon as it receives the RTS. If this is the case, enter a delay time to make sure the modem is able to transmit before it attempts to send the message.

Publication 1785-UM012D-EN-P - July 2005