RS 485 Communication

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anandharaju.muthusamy Active Contributor Join Date: Jul 2011 Posts: 10	RS 485 Communication 10/01/2011 12:25 AM
	How do I make RS 485 Communicate with Delta DVP-12SA PLC?
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#1 Re: RS 485 Communication 10/01/2011 9:34 AM
	Click here. __________________ "Love justice, you who rule the world" - Dante Alighieri
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Carl_E Power-User Join Date: Nov 2009 Posts: 335 Good Answers: 63	#2 Re: RS 485 Communication 10/01/2011 10:55 AM
	Most PLC's use the RS-232 port for programming. The listing of PC/PLC cables in the instruction sheet infers that the COM1 port is RS-232 for programming with either the handheld programmer or the Windows program. This model CPU can handle Modbus ASCII and Modbus RTU over RS-485. It isn't clear whether the RS-232 port is dedicated to programming only, but it is clear that it talks Modbus over the RS-485 comm port 2. If the question is really, "how do I get a Modbus master to communicate via Modbus RTU/ASCII with the DVP-SA via its RS-485 port?" then check out the instruction sheet for Modbus communication: http://www.delta.com.tw/product/em/control/plc/download/manual/RTU-485_instruction_tse.pdf There also appears to be a multipage step by step Modbus instruction guide here: https://files.pbworks.com/download/QR18YM7PTw/keltsouth/14108278/DVP%20communication%20Protocol.doc The PLC is a Modbus slave, so an external Modbus master is required to query or poll the PLC.
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