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Author Topic: second serial port  (Read 17479 times)

mhw

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second serial port
« on: February 18, 2016, 04:30:46 PM »
I need a second RS232 port on a T1H-DM1E rack. Any suggestions? Will a second T1H-DM1E work side by side off of the same power supply?
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BobO

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Re: second serial port
« Reply #1 on: February 18, 2016, 06:43:41 PM »
Yuk. I honestly don't know, probably should test that.
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mhw

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Re: second serial port
« Reply #2 on: February 18, 2016, 06:50:15 PM »
Quote
probably should test that
You or me?
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BobO

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Re: second serial port
« Reply #3 on: February 18, 2016, 06:56:14 PM »
Quote from: mhw on February 18, 2016, 06:50:15 PM
Quote
probably should test that
You or me?

Host. It'll hinge on the I/O discovery. If the CPU doesn't connect the discovery lines on the input side, it'll probably work. Sorry that there is no SERIO for Terminator. We sell quite a few, but it's still pretty niche and the ROI is pretty hard to justify for specialty modules. Agency approvals alone make it hard to justify.
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Controls Guy

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Re: second serial port
« Reply #4 on: February 18, 2016, 07:15:21 PM »
Talk out the Ethernet port with an Ethernet/serial converter, maybe?  Especially if it's a common protocol like Modbus or something.
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mhw

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Re: second serial port
« Reply #5 on: February 18, 2016, 08:28:57 PM »
Quote
Talk out the Ethernet port with an Ethernet/serial converter, maybe?  Especially if it's a common protocol like Modbus or something.
ASCII in and out to two scale heads. I don't have any experience with Ethernet/serial converters. Any recommendations on which one to use? Are they easy to implement?
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Controls Guy

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Re: second serial port
« Reply #6 on: February 18, 2016, 10:39:29 PM »
I haven't used them much either.  The only ones I've used have been protocol aware so they're either mapping requests on the Ethernet side to specific nodes on the serial side, or they have a scan list and a shared memory access area.  I was pretty happy with the Prosoft one, the Digi brand "Digi One IAP" is pretty good, and I know a guy who can probably give me a couple more suggestions as well...but those are all protocol-aware.  I have no idea what you'd have to do if it has to be transparent and just bridge from Ethernet to serial.  May be easier for all I know.

What scales?  For MT heads you can get an add-on Modbus/TCP card that works well and I assume a Modbus/RTU, either of which would help.  I'm sure you can also get Ethernet/IP support, and I assume Do-More's E/IP capability applies to the Terminator version as well.
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Controls Guy

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Re: second serial port
« Reply #7 on: February 18, 2016, 10:49:57 PM »
Or....is RS485 multidrop an option for the scale heads?  You could use the single serial port with a 232-485 converter.
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mhw

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Re: second serial port
« Reply #8 on: February 19, 2016, 06:28:20 AM »
The scale heads are a LP7510. The mail order company that my customer bought them from says that there are no other com options.
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ATU

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Re: second serial port
« Reply #9 on: February 19, 2016, 09:48:50 AM »
This might help
https://www.black-box.eu/en-int/si/1548/11891/MicroStat-2/V1.S1.F5102,5149.O3
I didn't use this one  but have used their multiplexers in the past with success.
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Controls Guy

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Re: second serial port
« Reply #10 on: February 19, 2016, 11:38:53 AM »
Quote from: mhw on February 19, 2016, 06:28:20 AM
The scale heads are a LP7510. The mail order company that my customer bought them from says that there are no other com options.

You might be able to find a non-protocol converter that just converts between Ethernet and serial (but somehow it has to be able to deal with two RS232 devices)

I think it it was me, I'd do one of two things.  Either I'd put in a H2-DM1E, just for the purpose of hosting the SERIO, move all the existing logic into it, and convert the Terminator stuff to just be remote I/O.  OR...roll your own protocol converter out of a PLC with two serial ports, whose only job is to handle the scale protocol, and present it in some kind of standardized way on its Ethernet port, say Modbus/TCP or something, and make that thing a slave to the existing Terminator Do-More.  A Do-More with a SERIO would work fine in this role as well.

OR...can the scales be interfaced with hardwired analog for weight, and discrete I/O's for tare and so on?
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mhw

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Re: second serial port
« Reply #11 on: February 19, 2016, 01:22:18 PM »
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roll your own protocol converter out of a PLC with two serial ports
I had already started down this path with a DL-O6 because of familiarity and availability. Now my problem is that the DLRX will not allow me to go to SS memory and I can't see how to extract what I need from a D memory.
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BobO

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Re: second serial port
« Reply #12 on: February 19, 2016, 01:24:09 PM »
STRGETB/STRPUTB allow you to access the raw data in string memory.
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BobO

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Re: second serial port
« Reply #13 on: February 19, 2016, 01:26:22 PM »
I'll also add that the new platform supports a second RS232 or RS485 port on the CPU...not to mention it being a low-cost brick CPU itself.
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mhw

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Re: second serial port
« Reply #14 on: February 19, 2016, 01:33:49 PM »
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STRGETB/STRPUTB allow you to access the raw data in string memory.
Quote
Wow, that was easy.
Thanks
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