Experimental Physics and Industrial Control System
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Hi Mark & Jakub,
while I have never worked with a Moxa we have connected serial line devices through terminal servers or later console switches from the beginning of using them with EPICS, starting with one that I first tried to connect directly to a serial line but found that one of the parameters needed a setting that I could only set on a terminal server. We're still running EPICS 3.13.8 and PPC IOCs with tnetDev and drvAscii and that has always worked. I hope EPICS didn't lose that capability with the newer versions? When I tried to upgrade to 3.15.6 and got as far as building a softIoc the first device I tried to talk to (but never succeeded) was a Lakeshore on a console switch (never got that to work, got side-tracked and haven't gotten back to it yet). I hope you're not saying that isn't going to work?
Thanks, Maren
Hi Jakub,
> I know there is external software I could use to create a virtual serial device from an ethernet connection, but is there a way to do this from within EPICS?
I don't know of a way to do that inside EPICS.
Moxa provides a "Real TTY" Linux driver that allows creating ports like /dev/ttyr00 to the Moxa device. These provide all of the serial port controls (baud, parity, etc.).
https://www.moxa.com.cn/getmedia/6fbafa79-1113-4953-a6cc-bef28dae1180/moxa-real-tty-driver-for-nport-tech-note-v1.0.pdf
Mark
________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Wlodek, Jakub via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, April 6, 2021 8:34 AM
To: tech-talk at aps.anl.gov
Subject: Handling Ethernet-to-Serial Connection when vendor SDK expects tty device
Good morning EPICS community,
I had the following question regarding one of the devices that I am currently working on supporting. Essentially, I am using an asynPortDriver
based driver integrated with the device vendor SDK. The vendor SDK has a connection function that expects a string representing either identification
for the USB device to communicate over the USB bus (this I have working fine), or a TTY serial device for communicating over serial (ex. /dev/ttyS0, COM1 on Windows).
When connected directly to the serial port of the target machine, the device connects and this works OK.
However, ideally, we would prefer to use a MOXA ethernet-to-serial adapter to talk to the device, and I am not sure what the best approach for this is. Traditionally,
for say a StreamDevice IOC I would use drvAsynIPPortConfigure(), and then configure the MOXA to communicate via serial on the other end, but given that
the device needs a serial device to connect, I wasn't sure how to handle that. I know there is external software I could use to create a virtual serial device from
an ethernet connection, but is there a way to do this from within EPICS?
Thanks,
Jakub
- Replies:
- Re: Handling Ethernet-to-Serial Connection when vendor SDK expects tty device Mark Rivers via Tech-talk
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- Handling Ethernet-to-Serial Connection when vendor SDK expects tty device Wlodek, Jakub via Tech-talk
- Re: Handling Ethernet-to-Serial Connection when vendor SDK expects tty device Mark Rivers via Tech-talk
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ANJ, 07 Apr 2021 |
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