I am trying to communicate with a rosemount 3095mfc flow transmitter. I have tried the rosemount engineering software with the hart modem, a 375, and a 275 and none of them will communicate with it. I have tried putting the 250 ohm resister every possible way that it is possible! I just cannot communicate with it for nothing. have you ever not been able to talk to a hart device because the hart comms went out? this is a brand new unit. I just dont understand what is the deal here.
anyone ever see a hart device comm go bad?
- Thread starter diat150
- Start date
danw
Lifetime Supporting Member
You're sure the transmitter is HART capable? Most Rosemount is, but is EVERYTHING HART?
You put 250 ohms in series, in the loop ?
Do you have an indicator or PLC AI input connected in the loop?
You have provided loop power?
The instrument turns on?
You put the HART leads acorss the transmitter's + & - ?
You're running generic HART (URV, LRV) or the communicators have the DD installed?
You put 250 ohms in series, in the loop ?
Do you have an indicator or PLC AI input connected in the loop?
You have provided loop power?
The instrument turns on?
You put the HART leads acorss the transmitter's + & - ?
You're running generic HART (URV, LRV) or the communicators have the DD installed?
Mickey
Lifetime Supporting Member
There are different version of the 3095. There is the 3095MV which supports Hart protocol. There is the 3095FB which has Modbus protocol only and its own software. I think there might be a couple others too.
Double check the complete part number.
Double check the complete part number.
yeah I am aware of all of them, because I work with all of them. the 3095 mfc is a mass flow computer that has a 3095 mv built onto a orifice plate. it is definitely a hart device, there is no question at all about that.
danw
Lifetime Supporting Member
1) I use a MacTek serial HART modem which has a utility that connects to the HART device, independent of the software, to confirm that the modem can 'see' the HART device.
I don't have a PC here with the driver loaded onto it to see its name, but the utility shows up in the Windows listing of programs in the modem's folder.
Does your HART modem have a similar utility?
2) The HART communicator has to have a specific file, called a Device Descriptor, or DD, installed in order to do anything more than a set of generic commands, like LRV, URV, eng. units., tag name, and a couple others.
But it sounds like you have no recognition of the device, not that you can't read the tertiary variable, right?
I don't have a PC here with the driver loaded onto it to see its name, but the utility shows up in the Windows listing of programs in the modem's folder.
Does your HART modem have a similar utility?
2) The HART communicator has to have a specific file, called a Device Descriptor, or DD, installed in order to do anything more than a set of generic commands, like LRV, URV, eng. units., tag name, and a couple others.
But it sounds like you have no recognition of the device, not that you can't read the tertiary variable, right?
apparently it was a problem with ac ripple voltage on the loop. you need 150 mv or less of ac ripple voltage for hart communications to work right. JUst a FYI.
I still cant get the hart modem on my laptop to work though.
I still cant get the hart modem on my laptop to work though.
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