# MODBUS module is incomplete (missing functions)

**URL:** <https://forums.digi.com/t/modbus-module-is-incomplete-missing-functions/9859>\
**Category:** Rabbit\
**Created:** [March 30, 2007, 9:56am UTC](https://forums.digi.com/t/modbus-module-is-incomplete-missing-functions/9859 "2007-03-30T09:56:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![edenboer](https://avatars.discourse-cdn.com/v4/letter/e/9d8465/32.png) [@edenboer](https://forums.digi.com/u/edenboer)\
**Post date:** [March 30, 2007, 9:56am UTC](https://forums.digi.com/t/modbus-module-is-incomplete-missing-functions/9859/1 "2007-03-30T09:56:10Z")

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Greetings,

I’m posting this here because this seems to be the most active forum.

I’m trying to create a modbus master device to connect to a slave, using the Modbus TCP protocol.

Anyway, connecting through TCP goes just fine, nothing wrong with that. But sending a simple WriteReg command seems to be the problem.

When I do this, I get an error saying that 2 functions are missing, namely:  
\_initMBMpacket();  
MBM\_Send\_ADU();

What gives? I mean… who would provide an incomplete product? I paid good money for this and it’s not working… did Zworld actually FORGET to write those functions?

Can someone help me?

Thanks in advance.