2010-06-14 13:46:38

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Need help regarding the communication problem that I faced when I used PXR9 for pooling PV data from computer.
I received wrong temp data (PV) when I tried to pool the data from PXR (replication from other station PV data
in e.g:
- In display: Station1(30F),Station2(40F),Station3(50F),Station4(60F),Station5(70F),Station6(80F),Station7(90F)
- When I tried to pool the data, from the station1, the result is 90F, which is the temp that display in
station7, and etc.

2010-06-15 09:27:16

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Hi Joe,
I guess you are using a Scada system or similar?
Anyway it looks to me as if there is something wrong with the station set up so please check:
- that each controller has a different station number (parameter "STno" on the third block)
- that you are pulling the data from the correct stations numbers to your computer.
Can you please also advise which address you are using to pull the PV?
Cheers

2010-06-15 14:37:24

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Thx for your reply

I tried to pool the data to computer using the programming (C++) due to my needs to develop the graphic for my analytical reasons

1. Station no. have already set up so each of those have unique station no.
2. I have check my algorithm, and it is right taking from the correct station (I use serial monitor to check the result also, and the answer is coming from the right station, but the PV value is incorrect (Shifted from other station))

PV address : 03E8H resister no.31001

2010-06-16 10:36:39

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Well it looks all good to me, that's strange.
Just trying to understand what's going on:
If - say - you remove station 7, what does the pooled data give you for station 1?
Same thing if you remove a station in the middle, like station 4?

2010-06-22 10:51:25

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Sorry for my delay response due to other project

If I remove station 7, the pooled data for sttaion1 is stabil but the other station (e.g. no.2) have instability as described. Same thing if I remove other station.

I just tried to compare the data received from mini scada vs. my program, hopefully it give me clue.

Any other suggestion?

Thx a lot

2010-06-23 08:44:06

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The behaviour is really strange!
Sorry I don't have any other suggestion for now, I will do some research.
Let me know what happens with mini Scada.
Cheers

2010-06-24 05:57:04

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I have tried using the mini scada, it goes very smooth... But, I find something strange in serial communication that could cause the result :

Request:
05 03 00 0F 00 05 B4 4E 06 03 00 0F 00 05 B4 7D

Answer:
06 03 0A 00 07 00 01 00 00 0F A0 00 01 DB F7

Any suggestion why could it be happened? Any setup / wiring that could cause other station answer the request that did not ask for them?

Thx

2010-06-24 12:55:35

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To further understand your problem. can you send us a wiring diagram of the commmunications wiring and the specification of the modem that you are using.
It sound as if you are using a serial peer to peer network (RS232), when in fact we need to ensure that we are wired and set up for Serial multidrop (RS485. If you were to send the diagram to sales@coulton.com, we will helpl you to resolve this issue.

2012-07-01 02:05:04

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Industrial grade Serial RS232 to Ethernet Converter, also called a Ethernet to RS232 Converter. The XetaServer 1000 is a cost efficeint industrial grade converter with support for RS485 and RS422 interfaces.

http://www.usconverters.com/index.php?main_page=product_info&cPath=66&products_id=225