Datamax v1.1x user manual Serial, Checkbox beside Extract from Received Data

Chapter 5 : Using Processes

5.7.1.Serial In

General introduction	The Serial In process allows you to create an input process that waits
	for data coming in from an auxiliary device.
	The format of the expected data is defined here, and a time out can be
	setup to avoid an indefinite wait for the input.
Serial In	To receive data from an auxiliary port, proceed as follows:
	1	Add the process Serial In to your label program
	2	Select the Communication Port that this process will use to receive
	3	data.
		In the Start with box, click the appropriate start character to
		beginning receiving:
		ƒ None if you do not want to wait for a special start character.
	4	ƒ STX if you want to wait for a Start-of-Text character.
		In the End with box, click the appropriate stop character to signal
		the end of the incoming data stream:
		ƒ ETX if you want an End-of-Text character as the stop
		character.
		ƒ CR if you want a Carriage Return as the stop character.
		ƒ Number of char if you want to stop receiving after a certain
		number of characters has been received. In the associated
		box, type a number or use the arrows to indicate the number
		of characters to be received from the auxiliary device (after
		the ‘Start with’ character has been received).
	5	ƒ Choose one of the other available options as appropriate
		If you want to extract only part of the received data, check the
	6	checkbox beside Extract from Received Data
		To extract from the received data, indicate the From position and
		the To position of the extraction by entering values or using the
	7	arrows to increment or decrement the existing values.
		In the Timeout box, set the time-out value to be used (in seconds).
		This option sets up a time-out duration for this process. When a
		time-out occurs, the If Error Goto branch of the process is
	8	executed.
		Identify the Result Variable in which the received data or
		extracted data should be saved.
	9	Click	to open the Variables dialogue box.
	10	Select or create the variable to be used to save the received data
	11	and click OK.
		In the If Error Goto box, select the action to perform or the
	12	screen to go to if an error occurs.
		Click OK
Example	This example waits for incoming data on serial com port 1. When a
	start-of-text character is received, the process will wait until 10
	characters have been received. When the 10 characters have been

placed in the input buffer, the serial port is closed and the data is passed to the application. Any additional characters are discarded.

The data found in positions 5-9 of the received data are extracted and saved in the variable [D9] Weight.

If a time-out occurs while receiving data, the application goes to screen 12 to display a communications error message.

October 2007 Page 156

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