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I have a RUT240 modem with fw 00.01.06.1. I have no problem reading modbus registers but I cannot write any register. I'm trying to do so using "modscan" program <https://www.win-tech.com/html/modscan32.htm> but everytime it says me "timeout"... someone can help me?

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Hi,

What exactly you want to make?  Which parameter you want to set?

All available Modbus commands:

https://wiki.teltonika.lt/view/RUT240_Modbus
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Hi, it will be great if the I/O pins will be accessible via ModBus command....

Someone know if Teltonika integrate this feature in the next releases of the firmware?

EDIT: I saw for the RUT950/955 it's already available https://wiki.teltonika.lt/view/Monitoring_via_Modbus

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Hi,

I would like to switch wifi on / off (register 210) and (less important) change APN. But everytime I try to access to register 210 or 211 or 213 or 220 I have message "Modbus message time-out"

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Hello everyone,

Did someone know if it is possible to switch the I/O Pins via ModBus?

Best regards, Marco
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Hi Federico,

Have you tried to switch to function 04, read input register or function 01, read coil status?

Ciao, Marco
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Hi Marco,

thanks for your answer. Yes, I already tried to use function 01 and 04 but I always have the same error.

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Identical problem for me, I can't write the parameter 210 modbus tcp of a Rut900 to deactivate / activate wifi but I can read the other registers. Has anyone managed to write register 210?

 Rut900 FW ver .: RUT9XX_R_00.06.05.3

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Hello Federico, I had your same problem with a rut900, I could only read the logs.

I solved it by installing an old firmware, you should try it too.
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I have solved the problem. These registers (coil registers) are impossible to read, it is only possible to write. So, I can write 1 or 0 and the modem switch wifi on / off, but I'm not able to know if wifi is enabled or disabled because the register is write-only.