from the Forum department...24VDC and RS-485 in same cable?
Same cable or not?
Roy... although you have had success, it doesn't mean every installation will be successful: See...
By Roy Matson on 8 August, 2009 - 1:39 am -
Yes, it's OK. Twisted pair cable would be preferable. I have often mixed different signals like...
from the Instrumentation department...U84 I/O rack with quantum 434 12 A CPU
Can anybody Guide me how U84 I/o rack can be configured in unity Pro with Quantum CPU 434-12A/U
from the Assistance Required department...Modbus TCP/IP device via RS232
Need a 'software serial port' that will allow my modbus RTU software to communicate with a modbus TCP/IP device
from the Instrumentation department...telemetry and wireless communication
Any one can explain telemetry system
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...
from the Forum department...Modbus frame size
Can I use the Modbus frame size larger than 256 bytes?
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...
By Mark on 7 August, 2009 - 8:07 am -
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...
By Jerry Miille on 6 August, 2009 - 12:33 pm -
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...
By Mark on 6 August, 2009 - 8:12 am -
Hello, The quick answer is no. "A protocol is a set of rules which is used by computers...
from the Forum department...Cable length limitations for DP-PA couplers
Cable length limitations for the DP-PA couplers and LInk
from the Automation List department...Moore APACS / iFix integration
Looking for a solution to setup communication of iFix with Moore APACS DCS
By Kevin DeWitt on 5 August, 2009 - 5:10 pm -
Is there any way to communicate from Moore Apacs to Ethernet I/P without using OPC into a IEM...
from the ARGGHHNET!!!! department...Intermittent Arcnet Communications
Intermittent loss of cummunication between a EX2000 and a UC2000 controller.
from the Electrical department...Using Mpi protocol for S7 200 programming
using Mpi protocol for S7 plc communication
from the Communication department...Open TCP/IP Communication
Exchange data between 2 device on TCP/IP
engg_ice, Is your application connecting an S7 with an AB drive? What protocol(s) does the...
from the Forum department...Satchwell Sigma Interrogation
In need of a software (or hardware) solution to read data out of a Sigma system on demand.
TAC have a Sigma DDE or OPC software driver, S-IC-GEN, Ethernet OPC or DDE PC software ...
from the Automation department...datalog in Factorytalk ME CPR9
data conversion problem
from the Forum department...Cicode function problem
Cicode function problem - Variable Tags
Hi Elish, You cannot take an integer variable and multiply it by 65535 as there will be a...
By elish on 3 August, 2009 - 7:40 am -
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...
By elish on 1 August, 2009 - 1:05 pm -
Hello Bryan, thanks for your help, i used ReadTag and defined that the problem is not in passing...
from the Automation List department...Modbus communication between S7 CP341 Modbus Master and other Modbus Slave
I have problem with modbus communication between Simatic PLC CP341 Master and a modbus slave.
By boy on 3 August, 2009 - 5:18 am -
Hi, What address should we input at LADDR parameter? Thanks...
from the Instrumentation department...Fire Resistant /Flame Retardant Cables
What type of cable can be used for Gas Detectors in Zone 0.
By arun on 3 August, 2009 - 2:03 am -
Fire resistant cables are intended for use in inter panel connections of electrical, electronics...
from the Remote Monitoring department...Web HMI
Web HMI for HVAC
By Mark on 1 August, 2009 - 4:52 pm -
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...
from the Forum department...Modbus to HART converter ?
Is it possible to convert Modbus signal from a field device to HART either in the field or in safe area ?
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)....
from the Forum department...Sinumerick numeric controller to wonderware
Communication of Sinumerick NC with wonderware
from the department...Modbus Plus
Does anyone have a favourite lightning arrestor / in-line surge suppressor that does not mess up a Modbus Plus trunk run?
By Ray Zimbal on 30 July, 2009 - 10:23 pm -
I agree with Daniel, take a look at Dehn & sons www.dehn-usa. They specialize in lightning and...
from the Forum department...DF1 Driver for Linux
I am looking for a DF1 driver for Linux
Thank you for the link. I will have a look...
from the Mechanical department...Labview cannot communicate with watlow f4s temperature controller
Trouble communicating NI visa in labview with the modbus protocol used by watlow F4S temperature controller.
from the Petroleum equipment department...Tokheim communication
Tokheim 67A,67B communication specification
from the Forum department...Broadcast on Modbus TCP
How do I handle Modbus broadcast requests on TCP when I convert it from a serial bus?
By John Correa on 29 July, 2009 - 7:15 pm -
In Modbus RTU broadcast is achieved using 0 as the slave address. TCP only encapsulate RTU frames...
from the Forum department...Protocol Converter from MODBUS RTU to proprietary protocol on TCPIP
Protocol Converter from MODBUS RTU to proprietary protocol(HAI Omni-Link II protocol) on TCPIP
Solutions from the simpler to the harder: 1.- Consult HAI if they have modbus rtu option cards. ...
By Andrzej on 29 July, 2009 - 9:12 am -
Hello, You should choose microcontroller with ethernet and serial port. For example Luminary...
from the RS-485 department...Modbus ASCII RS-485
How many slave devices cab be multidroped on RS-485 bus?
By Bud on 29 July, 2009 - 6:27 pm -
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...
By Andrzej on 29 July, 2009 - 9:07 am -
Hello, One Master and 31 slaves = 32 devices. The master is the device as a slave. Regards ...
from the c++ code for linux department...Simple C or C++ script to read serial port buffer
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..
By Umaima on 29 July, 2009 - 12:53 pm -
Hi there, plz send me the source code in c for sending the data to the serial port. ...
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