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Communications
Topic: Communications systems and equipment.
from the Forum department...
24VDC and RS-485 in same cable?
Originally posted by Boss on 7 August, 2009 - 11:40 am
Same cable or not?
New Replies:
Roy... although you have had success, it doesn't mean every installation will be successful: See...
Yes, it's OK. Twisted pair cable would be preferable. I have often mixed different signals like...
Topic: Communications systems and equipment.
from the Instrumentation department...
U84 I/O rack with quantum 434 12 A CPU
Posted by Harshal Patel on 7 August, 2009 - 11:36 pm
Can anybody Guide me how U84 I/o rack can be configured in unity Pro with Quantum CPU 434-12A/U
Topic: PLCs and related questions.
from the Assistance Required department...
Modbus TCP/IP device via RS232
Posted by Glyn on 7 August, 2009 - 5:12 pm
Need a 'software serial port' that will allow my modbus RTU software to communicate with a modbus TCP/IP device
Topic: Communications systems and equipment.
from the Instrumentation department...
telemetry and wireless communication
Originally posted by Manikandan on 7 August, 2009 - 12:10 am
Any one can explain telemetry system
New Replies:
By Gerald Beaudoin on 7 August, 2009 - 1:24 pm -
Cost difference? Costs could go either way. Depends on what is in between the two points and what...
Topic: Communications systems and equipment.
from the Forum department...
Modbus frame size
Originally posted by Bin on 6 August, 2009 - 5:25 am
Can I use the Modbus frame size larger than 256 bytes?
New Replies:
It's hard to suggest a good alternate protocol without knowing a lot about the application. So far,...
Thanks very much for all your reply. In my case, I am in control of both ends. I need to...
Hi, Since you are controlling both ends it might be advantageous to create your own. FTP...
Thanks very much for your reply. In my case, I am in control of both ends. I need to transfer...
If you are going to use Modbus, you are limited to a maximum of 255 bytes of data per message...
If you change the protocol it won't be Modbus anymore and it won't talk to Modbus devices. If...
No! If you notice in the Function Code 3 slave response the 3rd byte is the byte count of the data...
Hello, The quick answer is no. "A protocol is a set of rules which is used by computers...
Posted by Devdatt on 6 August, 2009 - 7:25 am
Cable length limitations for the DP-PA couplers and LInk
Topic: Human-Machine Interface and SCADA.
from the Automation List department...
Moore APACS / iFix integration
Originally posted by Stan Zaremba on 1 December, 2007 - 10:58 am
Looking for a solution to setup communication of iFix with Moore APACS DCS
New Replies:
Is there any way to communicate from Moore Apacs to Ethernet I/P without using OPC into a IEM...
Topic: Communications systems and equipment.
from the ARGGHHNET!!!! department...
Intermittent Arcnet Communications
Posted by MIKEVI on 5 August, 2009 - 2:40 pm
Intermittent loss of cummunication between a EX2000 and a UC2000 controller.
Topic: Engineering and workplace issues.
from the Electrical department...
Using Mpi protocol for S7 200 programming
Posted by Zahid Ali Khan on 5 August, 2009 - 4:57 am
using Mpi protocol for S7 plc communication
Topic: Communications systems and equipment.
from the Communication department...
Open TCP/IP Communication
Originally posted by engg_ice on 4 August, 2009 - 2:01 am
Exchange data between 2 device on TCP/IP
New Replies:
engg_ice, Is your application connecting an S7 with an AB drive? What protocol(s) does the...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Satchwell Sigma Interrogation
Originally posted by Rav Panchalingam on 10 July, 2009 - 12:54 am
In need of a software (or hardware) solution to read data out of a Sigma system on demand.
New Replies:
TAC have a Sigma DDE or OPC software driver, S-IC-GEN, Ethernet OPC or DDE PC software ...
Topic: Human-Machine Interface and SCADA.
from the Automation department...
datalog in Factorytalk ME CPR9
Posted by chaya on 4 August, 2009 - 2:42 am
data conversion problem
Topic: Computers in manufacturing; also hardware discussion.
from the Forum department...
Cicode function problem
Originally posted by Elish on 3 July, 2009 - 6:25 am
Cicode function problem - Variable Tags
New Replies:
Hi Elish, You cannot take an integer variable and multiply it by 65535 as there will be a...
Hello Oliver, thanks for help, i m using PM9 Schneider electric multimeter device. The protocol...
What power meter brand are you using and what is the protocol? If I understand your case...
Hello Bryan, thanks for your help, i used ReadTag and defined that the problem is not in passing...
Originally posted by Anonymous on 7 July, 2005 - 12:16 am
I have problem with modbus communication between Simatic PLC CP341 Master and a modbus slave.
New Replies:
Hi, What address should we input at LADDR parameter? Thanks...
Topic: Communications systems and equipment.
from the SNGPL department...
RS View 6.3
Posted by Hamad on 3 August, 2009 - 3:31 am
Download demo
Topic: Engineering and workplace issues.
from the Instrumentation department...
Fire Resistant /Flame Retardant Cables
Originally posted by Srinivas on 29 December, 2006 - 9:44 am
What type of cable can be used for Gas Detectors in Zone 0.
New Replies:
Fire resistant cables are intended for use in inter panel connections of electrical, electronics...
Topic: Application Questions and Problems
from the Remote Monitoring department...
Web HMI
Originally posted by BAM on 31 July, 2009 - 10:35 pm
Web HMI for HVAC
New Replies:
Hello, PeakHMI might be a good fit for you. Good luck, Mark http://www.peakhmi.com/...
I have a free web based HMI called "HMI-Server" that might be suitable. You can download...
Topic: Communications systems and equipment.
from the Forum department...
Modbus to HART converter ?
Originally posted by moduser on 31 July, 2009 - 4:41 am
Is it possible to convert Modbus signal from a field device to HART either in the field or in safe area ?
New Replies:
Here's an old thread with some info regarding modbus->hart conversion... ...
Check out the Modbus Organization's Modbus Device Directory (http://www.modbus.org/devices.php)....
Posted by Sebu on 31 July, 2009 - 3:14 am
Communication of Sinumerick NC with wonderware
Topic: Communications systems and equipment.
from the department...
Modbus Plus
Originally posted by Ranjan Acharya on 22 July, 2002 - 4:33 pm
Does anyone have a favourite lightning arrestor / in-line surge suppressor that does not mess up a Modbus Plus trunk run?
New Replies:
I agree with Daniel, take a look at Dehn & sons www.dehn-usa. They specialize in lightning and...
Topic: PLCs and related questions.
from the Forum department...
DF1 Driver for Linux
Originally posted by Robert Herrmann on 22 July, 2009 - 10:51 am
I am looking for a DF1 driver for Linux
New Replies:
Thank you for the link. I will have a look...
Posted by Preeti Chauhan on 30 July, 2009 - 1:09 am
Trouble communicating NI visa in labview with the modbus protocol used by watlow F4S temperature controller.
Topic: Communications systems and equipment.
from the Petroleum equipment department...
Tokheim communication
Posted by sanjeev on 29 July, 2009 - 11:55 pm
Tokheim 67A,67B communication specification
Topic: Communications systems and equipment.
from the Forum department...
Broadcast on Modbus TCP
Originally posted by Ilan on 28 July, 2009 - 2:36 am
How do I handle Modbus broadcast requests on TCP when I convert it from a serial bus?
New Replies:
In Modbus RTU broadcast is achieved using 0 as the slave address. TCP only encapsulate RTU frames...
Originally posted by Prasanthi on 20 July, 2009 - 11:12 pm
Protocol Converter from MODBUS RTU to proprietary protocol(HAI Omni-Link II protocol) on TCPIP
New Replies:
Solutions from the simpler to the harder: 1.- Consult HAI if they have modbus rtu option cards. ...
Hello, You should choose microcontroller with ethernet and serial port. For example Luminary...
Topic: Communications systems and equipment.
from the RS-485 department...
Modbus ASCII RS-485
Originally posted by Vinod Gavande on 29 July, 2009 - 1:32 am
How many slave devices cab be multidroped on RS-485 bus?
New Replies:
A couple years ago, I ran into a specific vendor's single loop controller that limited the number...
This is an electrical limitation of RS-485, not something to do with the protocol. It has to do...
The Master is just another device, so 32 including the Master is your correct answer. Remember, the...
Hello, One Master and 31 slaves = 32 devices. The master is the device as a slave. Regards ...
Topic: Open interfaces, software and hardware
from the c++ code for linux department...
Simple C or C++ script to read serial port buffer
Originally posted by Obscurius on 27 August, 2004 - 1:31 am
I would like to read a text string from a device which connected to the serial port and save this string to a text file or in to a database..
New Replies:
Hi there, plz send me the source code in c for sending the data to the serial port. ...

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