Programming instructions

Intermec Fingerprint v7.61 – Programmer’s Reference Manual Ed. 7 45

Chapter 2 Program Instructions

COMBUF$

Field of Application

Function reading the data in the buffer of the communication channel

speciﬁ ed by a COMSET statement.

Syntax COMBUF$(<nexp>)

<nexp> is one of the following communication channels:

1 = "uart1:"

2 = "uart2:"

3 = "uart3:"

4 = "centronics:"

5 = "net1:"

6 = "usb1:"

Remarks

This function is closely related to COMSET, ON COMSET GOSUB,

COMSET ON, COMSET OFF, COM ERROR ON/OFF, and COMSTAT.

Using COMBUF$, the buffer can be read and the content be used in

your program.

When the communication has been interrupted by any of the three conditions

"end character", "attention string", or "max. no. of char." (see COMSET), you

may use an ON COMSET GOSUB subroutine and assign the data from the

buffer to a variable as illustrated in the example below.

Note that COMBUF$ ﬁ lters out any incoming ASCII 00 dec. characters

(NUL).

Example

In this example, the data from the buffer is assigned to the string variable

A$ and printed on the screen:

1 REM Exit program with #STOP&

10 COMSET1,"#","&","ZYX","=",50

20 ON COMSET 1 GOSUB 2000

30 COMSET 1 ON

40 IF A$ <> "STOP" THEN GOTO 40

50 COMSET 1 OFF

.....

1000 END

2000 A$= COMBUF$(1)

2010 PRINT A$

2020 COMSET 1 ON

2030 RETURN