LabView- RS232 for Tenma Multimeter

[opljde]

Hi all,

I am trying to stablish a RS232 communication with a Tenma Multimeter. From its Operating Manual the settings are:

Baud Rate 2400

Stop bit 1

Data bits 7

Parity Odd

After searching on NI Forums I have been able to come up with this VI that always give me the same error when I try to read, -1073807254: A parity error occurred during transfer. 

Any insight to this problem?

[nyc_(is_out_of_here)]

I always first use Hyperterminal or something like it to establish communication with the instrument.

Once that works, then I automate with LabVIEW.

[DanHarryman]

Hi Opljde

After looking at your code I noticed there was a coercion dot on the "Serial settings: Parity" input. However when I deleted the control attached to this and then right clicked the terminal on the property node to create a control it made another enum control of representation U16 (same as your enum). This did however make the coercion dot disappear. This would be the first thing I would try as your error is a one that would imply its from the parity bit.

Many Thanks

Daniel Harryman
Application Engineer

National Instruments

[crossrulz]

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@DanHarryman wrote:

Hi Opljde

After looking at your code I noticed there was a coercion dot on the "Serial settings: Parity" input. However when I deleted the control attached to this and then right clicked the terminal on the property node to create a control it made another enum control of representation U16 (same as your enum). This did however make the coercion dot disappear. This would be the first thing I would try as your error is a one that would imply its from the parity bit.

Many Thanks

Daniel Harryman
Application Engineer

National Instruments

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That coercion is because the property node actually wants a ring, not an enum.  But all of the settings are the same, so I wouldn't expect that to be the issue.

It is rare to get an instrument that uses parity.  Try changing the parity setting to see if you can get it to work.

[Wgli]

We have found analyzing the original cable a different configuration than classical RS232 cable, please verify wiring connection of the original cable adapter. We saw it function with hyperterminal.