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COM ERROR ON/OFF
Chapter 2 Program Instructions
Field of Application Statement enabling/disabling error handling on the specified
communication channel.
Syntax COM ERRORON|OFF
↔
is one of the following communication channels:
1 = "uart1:"
2 = "uart2:"
3 = "uart3:"
4 = "centronics:"
Default: COM ERROR OFF on all channels.
Remarks This function is closely related to COMSET, ON COMSET GOSUB,
COMSET ON, COMSET OFF, COM STAT and COMBUF$.
Each character received is checked for the following errors:
• Received break
• Framing error
• Parity Error
• Overrun error
If any such communication error occurs and COM ERROR is ON for the
channel in question, the reception will be interrupted. This condition can be
read by means of a COMSTAT function, but you cannot read exactly what
type of error has occurred. COM ERROR OFF disables this type of errorhandling
for the specified channel.
Example In this example, a message will appear on the screen when the reception is
interrupted by any of four COMSET conditions being fulfilled:
10 COM ERROR 1 ON
20 A$="Max. number of char. received"
30 B$="End char. received"
40 C$="Attn. string received"
50 D$="Communication error"
60 COMSET 1, "A",CHR$(90),"#","BREAK",20
70 ON COMSET 1 GOSUB 1000
80 COMSET 1 ON
90 IF QDATA$="" THEN GOTO 90
100 END
1000 QDATA$=COMBUF$(1)
1010 IF COMSTAT(1) AND 2 THEN PRINT A$
1020 IF COMSTAT(1) AND 4 THEN PRINT B$
1030 IF COMSTAT(1) AND 8 THEN PRINT C$
1040 IF COMSTAT(1) AND 32 THEN PRINT D$
1050 PRINT QDATA$:RETURN
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