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Technical support / RS-485 problem
« on: March 14, 2007, 03:37:16 AM »
Hello,
I'm a new user of PLC.
I have a problem about RS-485 communication between PLC and PC.
The PLC model is T100MD888+. I want to develop a program by using VB 2005.
The RS-485 has three modes, I tried to using TxRTS RxRTS mode.
In TLserver transmits data is successful, but it is fail of using the open source VB.net program.
http://www.tri-plc.com/appnotes/VBasicDotNetComm.htm
But it is also fail on TxRTS RxON, the result will not a direct command.
Is the problem on RTS?
http://www.aten-usa.com/?product&cat=594&Item=IC485S&PHPSESSID=57455b500b87e720dc1571b777d06509
This is the model of RS-485 which is I'm using.
I'm a new user of PLC.
I have a problem about RS-485 communication between PLC and PC.
The PLC model is T100MD888+. I want to develop a program by using VB 2005.
The RS-485 has three modes, I tried to using TxRTS RxRTS mode.
In TLserver transmits data is successful, but it is fail of using the open source VB.net program.
http://www.tri-plc.com/appnotes/VBasicDotNetComm.htm
But it is also fail on TxRTS RxON, the result will not a direct command.
Is the problem on RTS?
http://www.aten-usa.com/?product&cat=594&Item=IC485S&PHPSESSID=57455b500b87e720dc1571b777d06509
This is the model of RS-485 which is I'm using.