Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Mon, 5 Dec 2016 01:03:17 +0000

Hi Pilkyu,

Your input looks similar to what we receive from the Gamma Vacuum MPC controller:

This is what you get when I put it on one line:

\377\372,j`\377\36005 OK 00 6.4E-10 TORR B1\r\000

This is what I get when from an MPC I put it one one line:
00 OK 00 3.9E-09 TORR B6\r

It looks to me like you may not be correctly reading the checksum at the end of the previous response, and it is getting added at the beginning of your next response.

If this is indeed an MPC you can simply use the device support in devMPC.c here:

https://github.com/epics-modules/ip/blob/master/ipApp/src/devMPC.c

Mark

________________________________________
From: [email protected] [[email protected]] on behalf of Mark Rivers [[email protected]]
Sent: Sunday, December 04, 2016 6:51 PM
To: Pilkyu Jung; Ralph Lange
Cc: [email protected]
Subject: RE: Capturing data from string which is sent by device

Hi Pilkyu,

What model Gamma Vacuum ion pump controller is this?  There are already EPICS drivers for several models.

Does the documentation for the the controller describe the \377\372 characters you are getting?  If not is it possible that you have got the serial communication parameters wrong, like stop bits or parity?

Mark

________________________________
From: [email protected] [[email protected]] on behalf of Pilkyu Jung [[email protected]]
Sent: Sunday, December 04, 2016 6:26 PM
To: Ralph Lange
Cc: [email protected]
Subject: Re: Capturing data from string which is sent by device

hi, Ralph

This is information of device,

Gamma Vacuum Ion Pump with controller.

By the way, How can I get rid of the unwanted characters which are "\377\372,j`\377\36005 OK 00 TORR B1" for getting only interested data? I guess need to use @mismatch(exception handler) but the things of example which is in stream manual is too weak for me.

Best Regards,
PilkyuJung

On 12/02/2016 05:52 PM, Ralph Lange wrote:
Hi Pilkyu,

Can you tell the vendor and type of your device?
If it is a common product, there's a good chance that a tested protocol and sample database already exist.

Otherwise, you will have to get rid of the unwanted characters in the 'in' part of your protocol, until only the number you're interested in gets extracted and pushed to the record.

Cheers,
~Ralph

On Fri, Dec 2, 2016 at 9:33 AM, 정필규 <[email protected]<mailto:[email protected]>> wrote:

Hi all,

I'm Pilkyu Jung who is working with EPICS in Korea.

When I receive data from device on IOC, I have a problem. Normally device sends data like this "current 3.2 A", "0.1 V" etc. at least I was knowing like that.

but, these days I got a new device which is vacuum ion pump. IOC connected with the device perfectly. However, that device sent data like this.

------------------------------------------------------------------------------------------

2016/12/02 17:09:18.992 169.254.90.249:10001<http://169.254.90.249:10001> read 19

\377\372,j`\377\36005 OK 00 6.4

2016/12/02 17:09:19.012 169.254.90.249:10001<http://169.254.90.249:10001> read 14

E-10 TORR B1\r\000

2016/12/02 17:09:19.012361 P1 dbPut: 10MeV:TM:ST_x_Pressure_R1(10MeV:TM:ST_x_Pressure_R1.VAL, DBF_STRING, "��,j`��05 OK 00 6.4E-10 TORR B1") failed

------------------------------------------------------------------------------------------

So, I can't get only real data(6.5E-10). It makes me can't capture data in PV. Then when I express data by caget, it just express 0, like this.
------------------------------------------------------------------------------------------
localhost.localdomain[15]# caget 10MeV:TM:ST_x_Pressure_R1
10MeV:TM:ST_x_Pressure_R1      0
------------------------------------------------------------------------------------------

 If I wanna capture only real data(6.4E-10) how can I do? Here is my .db and .proto files.
------------------------------------------------------------------------------------------
record( ai, "$(P)$(R)ST_x_Pressure_R1"){
field( DESC, "Pressure read")
field( DTYP, "stream")
field( INP, "@devvacuum.proto getPRS $(PORT1) $(A)")
field( EGU, "Torr")
field( SCAN, "2 second")
}
------------------------------------------------------------------------------------------
getPRS{
out "~ 05 0b 01 00 ";
in "%e TORR";
}
------------------------------------------------------------------------------------------

Best Regards,
PilkyuJung
Tel.+82-10-9067-3109<tel:+82%2010-9067-3109>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System