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Charles Emrick
Dec 14, 2012, 1:08:57 PM12/14/12
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I am using PB10 to communicate with a VXM that only returns a CR
with certain commands. After a R (run) command is given, the controller
returns a "^" with an optional CR upon completion of the task.
I prefer not to use "open loop" commands without knowing equipment status. Is there a method to "mask" the COMM Line requirement for both CR/LF or do I need to use a different approach? I thought about using the COMM function with RXQUE but didn't know how to check for "^" and then clear the RXQUE as it is read only.
Any suggestions would be appreciated.
Thank You
I prefer not to use "open loop" commands without knowing equipment status. Is there a method to "mask" the COMM Line requirement for both CR/LF or do I need to use a different approach? I thought about using the COMM function with RXQUE but didn't know how to check for "^" and then clear the RXQUE as it is read only.
Any suggestions would be appreciated.
Thank You
Cliff
Dec 14, 2012, 6:13:52 PM12/14/12
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Hi Charles,
From the PowerBasic documentation "COMM LINE [INPUT] [#] hComm, string_var"
"Read a delimited line of data from the receive buffer, where a "line" is defined as a stream of data that is terminated by a CR/LF"
Since the VXM does not send $CRLF then you should be using "COMM RECV [#] hComm, count&, string_var"
"Retrieve the count& number of bytes from the receive buffer, placing the results in string_var. Program execution will halt until count& bytes are available, so it is wise to check how many bytes are available before making a COMM RECV request"
For Example:
Qty& = COMM(#hComm, RXQUE)
COMM RECV #hComm, Qty&, a$
From the PowerBasic documentation "COMM LINE [INPUT] [#] hComm, string_var"
"Read a delimited line of data from the receive buffer, where a "line" is defined as a stream of data that is terminated by a CR/LF"
Since the VXM does not send $CRLF then you should be using "COMM RECV [#] hComm, count&, string_var"
"Retrieve the count& number of bytes from the receive buffer, placing the results in string_var. Program execution will halt until count& bytes are available, so it is wise to check how many bytes are available before making a COMM RECV request"
For Example:
Qty& = COMM(#hComm, RXQUE)
COMM RECV #hComm, Qty&, a$
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