RS232 ASCII String - How to put in a register? - PLCS.net

donl517 · July 25th, 2006, 06:40 PM

I am receiving an ASCII string via RS232; is it possible to send that data to an N7 register directly? (i.e. ASCII String = N7:0,01)
Will a Micrologix 1500 know what to do with this or do I have to handle it another way?

Thanks,
Don

TWControls · July 25th, 2006, 06:47 PM

No, usually you will have to read the string from the buffer(ARD,ARL), extract the number which will still be stored as a string(AEX), then convert it to an integer (ACI)

What is sending the string?

donl517 · July 25th, 2006, 06:53 PM

It is coming from an SMAC test unit. They can send anything I want; So I can read it into the ST register and do a string compare as well. I was just curious if there was a way to code it to go directly into a register other than the ST register.

Thanks,
Don

TWControls · July 25th, 2006, 07:01 PM

Is ASCII over RS232 the only option they have?

donl517 · July 25th, 2006, 07:05 PM

Yes & No, They have I/O on the unit but we have used it all. So we are looking at other avenues of sending a ready signal. I think I will program a first pass to clear the ASCII string at startup and then clear it again at cycle start. That should get me what I need.

Thanks,
Don

Rick-RTA · July 27th, 2006, 05:39 PM

Don,

There is an ASCII to PLC Gateway from Real Time Automation that works great. It will take your string data and send it right to a string register in your Micrologix. The part is 435NBS. They have din rail or panel mounting. Very little logic is needed.
http://www.rtaautomation.com/ethernetip/435nba/
They show the 435NBA for the Contrologix family. They only difference really is that the 435NBA sends data to a tag and the 435NBS will be sending to a register.

Rick

July 25th, 2006, 06:40 PM	#1
donl517 Member Join Date: Dec 2005 Location: Michigan Posts: 124	RS232 ASCII String - How to put in a register? I am receiving an ASCII string via RS232; is it possible to send that data to an N7 register directly? (i.e. ASCII String = N7:0,01) Will a Micrologix 1500 know what to do with this or do I have to handle it another way? Thanks, Don __________________ If God had wanted us to think...

July 25th, 2006, 06:53 PM	#3
donl517 Member Join Date: Dec 2005 Location: Michigan Posts: 124	It is coming from an SMAC test unit. They can send anything I want; So I can read it into the ST register and do a string compare as well. I was just curious if there was a way to code it to go directly into a register other than the ST register. Thanks, Don __________________ If God had wanted us to think...

July 25th, 2006, 07:05 PM	#5
donl517 Member Join Date: Dec 2005 Location: Michigan Posts: 124	Yes & No, They have I/O on the unit but we have used it all. So we are looking at other avenues of sending a ready signal. I think I will program a first pass to clear the ASCII string at startup and then clear it again at cycle start. That should get me what I need. Thanks, Don __________________ If God had wanted us to think...

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July 25th, 2006, 06:47 PM	#2
TWControls Lifetime Supporting Member Join Date: Oct 2005 Location: Roanoke, VA Posts: 2,081	No, usually you will have to read the string from the buffer(ARD,ARL), extract the number which will still be stored as a string(AEX), then convert it to an integer (ACI) What is sending the string?

July 25th, 2006, 07:01 PM	#4
TWControls Lifetime Supporting Member Join Date: Oct 2005 Location: Roanoke, VA Posts: 2,081	Is ASCII over RS232 the only option they have?

July 27th, 2006, 05:39 PM	#6
Rick-RTA Member Join Date: Feb 2006 Location: Wisconsin Posts: 34	Don, There is an ASCII to PLC Gateway from Real Time Automation that works great. It will take your string data and send it right to a string register in your Micrologix. The part is 435NBS. They have din rail or panel mounting. Very little logic is needed. http://www.rtaautomation.com/ethernetip/435nba/ They show the 435NBA for the Contrologix family. They only difference really is that the 435NBA sends data to a tag and the 435NBS will be sending to a register. Rick

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