Communication with FP Ethernet timeoutsettings ?

[MrSieb]

Hi there!

Is there a possibility to increase the time out!
When Lookout lost the Communication with the FP Modul
the "Bad quality recevived from Network" error appears.
(using Lookout 5.1 , FP Objekt)

Does anybody exactly know how Lookout  communicate with FP?
I know FP Moduls only send an massage when some Value change.
I also checked this with an Networkmonitor, but when
I start lookout , lookout seams to poll more then one request every seconds why ?

My Problem is:
I  communicate over a RADIO FM Modem so my bandwith is very tiny
and every "bad quality from network" error wasting my bandwith .

[Jochen]

Lookout communicates with FieldPoint using the native network protocol of both products (Lookout and FP). This protocol is called LOGOS. Additionally to the event driven communication a heartbeat is running all the time to check if the communication is lost or not.

Please have a look at this document in our knowledge base for more information about LOGOS. I don't think that there is a way to to change the internal timing of the LOGOS protocol.

Best regards,

Jochen Klier
National Instruments Germany

[MrSieb]

Hi!
thx for answering!

This document means
http://digital.ni.com/public.nsf/websearch/31c23f7f5b5973a486256e910059eb67

FP 20xx Modules are also listet as Poll-Driven Controllers
How can i  do so ?

Message Edited by MrSieb on 07-18-2005 01:23 AM

Message Edited by MrSieb on 07-18-2005 01:24 AM

[Jochen]

The document you are referring to is a bit mistakable. FP-20xx modules work only in polled mode when you run a program written in LabVIEW RT  on the FP-20xx controller. In your use case the FP-20xx acts like a FP-160x (= host communication through Logos). Thus the device works in event driven mode as stated in the document.

If you want to customize the communication method to your needs you could program a LabVIEW RT program that acts as a TCP/IP server. In Lookout you could use the IPASCII object to communicate to the FTP-20xx by sending TCP/IP commands. In this case you would have to implement your own command set and communication structure but you would have complete control over the communication.

Best regards,

Jochen Klier
National Instruments Germany

Message Edited by Jochen on 07-18-2005 08:40 AM

[MrSieb]

IPASCII object

Sounds be cool. That could really solve my problem.
Did you have any infos about the syntax for response and request frame.
I found some docs about using Logos with Datasocket
but no example for lookout.

[Jochen]

If you want to use the IPASCII object you will need to define your own high level communication syntax. You can't use Logos for this task. E. g. if you want the FP-2000 to send you all channel values from module 1 you could send a string to the TCP/IP server on the FP-2000 (e. g. "Return_All_Items_MD1"). You will need to program your TCP/IP server application to react on these type of strings in a proper way and to return the information you asked for in a format that can be parsed to numeric values with an expression in Lookout.
This is not standard functionality and it requires an individual program written in LabVIEW RT.

I hope this helps.

Jochen