Worth Data 7000 manual Other Settings, Preamble, Nnmm

Other Settings

Preamble

Preambles are user-defined data that is attached to the beginning of data (bar code or keyed) that is transmitted to the host by the RF Terminal. For example, if you set a preamble of @@ and scanned bar code data of 12345, @@12345 would be transmitted to the host.

By default, the RF Terminal has no preambles configured. Preambles can contain up to 15 characters entered from the keypad or scanned from the bar coded FULL ASCII Menu. To set a preamble:

1.Select option “8” from the RF Terminal Setup menu then “1” for Preamble from the Other Settings menu.

2.Enter the desired characters (up to 15). Pressing the shift key will turn the cursor red to indicate that the shift is active. Pressing shift again will turn the cursor white and return to unshifted mode.

3.Press “ENTER”.when you are finished entering data.

4.To clear the Preamble and return to the default (no Preamble defined), press “CLEAR”.

You can use the Preamble to trim characters from the data you are entering into the RF Terminal. You can trim from 1-15 characters from the data by creating a preamble of:

~x

where ~ is ASCII 126 and x is a single hex digit 1-F (corresponding to 1-15). Data that is shorter than the trim amount is transmitted without trimming. Preambles trim characters from the front of the data. Here are some examples:

Data	Preamble	Data Transmitted
123	XYZ	XYZ123
12345678	~3XYZ	XYZ45678
12345678	~9	12345678
12345678901	~A	1
123456	~5	6
	Preamble trims leading characters

Using the Bar Code ID feature and the Preamble, you can trim data selectively, trimming characters only on the bar code type specified. To use selective trimming, enter:

~bx

where b is the Bar Code ID character (see the Code 128 setup parameter) and x is the number of characters to trim from the front of the data. For example, ~b2~c1 says “trim 2 characters from Code 39 data and 1 character from UPC-A data”. Remember that the Preamble trims leading data. This applies to One-Way and host prompted communication.

Lastly, the Preamble can be used to check a minimum/maximum data length for bar code data entered. To check for bar code length in the Preamble enter:

nnmm

where is ASCII 124, nn is the two-digit minimum and mm is the two-digit maximum. 0210 would check for a minimum of 2 characters and a maxi-mum of 10. If you try to scan a bar code outside the minimum or maximum