![modbus poll response 255 modbus poll response 255](http://downloads.fyxm.net/img/thumbs-sw/5/5181.jpg)
![modbus poll response 255 modbus poll response 255](https://www.codeproject.com/KB/trace/modbuscs/modbusCS.jpg)
- Modbus poll response 255 how to#
- Modbus poll response 255 serial#
- Modbus poll response 255 full#
- Modbus poll response 255 software#
Modbus poll response 255 how to#
Look around in the device documentation or contact the manufacturer to find out how to change the slave ID number. TIA is following the Modbus Spec and addressing the slave address range that conforms to the Modbus spec. It is not a question of some hidden methof of communicating with slave ID 255, unless you write own custom driver.
Modbus poll response 255 serial#
of the Modbus Standard, MODBUS over serial line specification and implementation guide V1.02 by the Modbus-IDA.ORG states that Modbus Slave Addresses range from 1-247, with 0 being reserved as the broadcase address.
Modbus poll response 255 software#
Other use utility software to configure the slave address. Some use a keyboard and display to configure the slave address. Some devices use hardware DIP switches, rotary switches, or jumpers. Your 3rd party device likely has some means of changing the slave address. Can you pls give us clear info what data you want get from Slave? Yes, generally recommendation is set another Slave address inside device if it's not suficcient for you but again, I don't see problem use extended range of Slave address.A device stuck at slave address 255 is likely to be useless because it falls outside the Modbus spec. From your LOG byte sequence is clear correct data exchange probably. Pls be kind ask about one wanted data requirement and not mix and ask different things, this is simply hard to answer then. From your first screenshot you want read some range of INT registers but from LOG you show different FC required data, write/preset to Holding register. Problem I see in your code and first screenshot, then with your LOG byte sequence.
Modbus poll response 255 full#
If you set true to this static parameter you can use extended addressing of Slave address to full WORD range value. Extended addressing with Slave address is ok and have nothing to register address extended range. Sry but I see some missunderstanding and not familiar with Modbus protocol. The slave id has a kind of a start up log which is the request form Master "FF 06 00 09 00 01 8D D6" and then it answer to "FF 06 00 09 00 01 8D D6" which is setting the address to slave Id1 from 255, but unforunatley I cannot reach 255!! which is frustrating and I don't know how to go further! and it seems strange that I cannot achieve that WITH Tia. The error that you picked up is because of no communication between Master and Slave, and is caused because master can't see beyond the 247 slave id. I have tried to use a Modbus software(Mbpoll) and the device answer correctly to the #FF id Slave, the Extended_Addressing by reading in different forum is referred to the registers and not to the actual slave Id, which for Siemens is from 1-247, and cannot go above that.
![modbus poll response 255 modbus poll response 255](https://i.stack.imgur.com/t4rfS.png)
A device stuck at slave address 255 is likely to be useless because it falls outside the Modbus spec.