Yokogawa JUXTA VJ Series Limit Alarms User Manual
Page 30
3-16
<3. PC Link Communication >
IM 77J01J11-01E
3.3.1
Example of Communication Program Created Using Visual
Basic
This subsection shows a sample program created using Microsoft Visual Basic 6.0.
Operation verification environment: PC/AT compatible machine + Windows NT 4.0
(SP4), Windows 95
PC/AT is a product of International Business Machine Corp.
Visual Basic is a registered trademark of Microsoft Corporation.
See Also
MSDN and commercially available documentation for information on Visual Basic programming.
The sample program reads the contents of D register D0002 using the PC link communica-
tion protocol. When you press the Command button, the commands sent and responses
received will be displayed in a form. If no response is received, a timeout will occur.
030301E.EPS
'==========================================================
' Program name: Sample
'
' RS-485 communication program for VJ series
'
'============================= YOKOGAWA Electric Corporation ===
'
'Definition of public variables
Public fSend As Boolean
'Sending flag
Public strSend As String
'Character string sent
Public strBuf1 As String
'Character (1 byte) received
Public strReceive As String
'Character string received
'When the Command button is pressed,
Private Sub Command1_Click()
strSend = "01010WRDD0002,01"
'Character string to be sent
'[stx]01010WRDD0003,01[etx][cr]
3rd Edition : Oct. 15, 2007-00