Elo TouchSystems 1525L manual 129, If Err.Number 0 Then

Section 5. Example Applications

If Err.Number <> 0 Then

'Process error using Err.Description

'contains error description for the demo,

'we'll just display it

txtInfo.Text = Err.Description

'Reset the error handling

On Error GoTo 0

'exit this sub

Exit Sub

End If

'reset the error handling

On Error GoTo 0

'send the command to get the port number

Put #1, , "/get port_name" + Chr$(10)

'get the response from driver which should contain the

'com port number

Get #1, , buf$

'Expected response:

'(character position in the response string)

'11111111112222222222

'12345678901234567890123456789

' e.g. "/get port_name COM14"

'+=========================================+

'	IMPORTANT: CLOSE THE DEVICE	DRIVER
'	BEFORE TRYING TO	REOPEN	IT

'+=========================================+

Close #1

' Make sure we got back a valid response.

‘This checks that we have received a “/get” response and that

‘“port_name” and “COM” are present and in the right locations.

If Left(buf, 4) = "/get" _

And InStr(buf, "port_name") = 13 _ And InStr(buf, "COM") = 25 Then

'Just for information, display the com port number txtInfo.Text = "Opening Serial IO on port " & Mid(buf, 25, 5)

'Get the port number value from character position 28

'(and 29 if two digits long) of the response

PortNumber = Val(Mid(buf, 28, 2))

'+------------------------------------+

'	open the driver as a serial device
'+	------------------------------------+

'make sure the on_comm function will be

'triggered by the device driver by setting

'the receive threshold to 1 (one)

MSComm1.RThreshold = 1

129