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UE9 Modbus TCP

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nobody725
UE9 Modbus TCP

Hi,

When I read the voltages of channel 16 to 31 via Modbus TCP by using starting address of 32; quantity of 32.  The voltages of channel 30 & 31 always zero.  But if I read the voltages of channel 16 to 23 by using starting address of 32; quantity of 16 and then read the voltages of channel 24 to 31 by starting address of 48; quantity of 16.  The voltage readings are perfect.  Can I read the the 16 voltages in a single request?

LabJack Support
LabJack Support's picture
Due to packet size

Due to packet size limitations you can only read ten registers at once. I may be wrong on that number.

If you use the low level functions you can read more channels in a single packet, but the values will be binary.

nobody725
I know that I can read the

I know that I can read the user mem via modbus TCP. Is it possible to write the user mem via modbus TCP?

LabJack Support
LabJack Support's picture
The user mem can only be

The user mem can only be written using the low-level protocol.