Hello,

can you be kind describe better what exactly you want to do, what SW and HW you expect to use?

Hello,

pls be kind next time to put your translation text as COPY/PASTE and not drag&drop from translator because read your post with slider is horrible procedure

User

good morning!  I'm using an S7-1500 with an 6ES7 540-1ab00-0aa0 card to read from a third party modbus RTU device. I made the same logic as Kenzo103, creating the logic with the Receive_P2P and SEND_P2P blocks. In my case, I will only use Receive_p2p to read the data received from the Modbus RTU device.  I created communication on the physical medium using pins 4, 11 and 8 (ground). I am testing communication via modbus Poll and the card's LED flashes RXD.

The Status in the Receive_p2p block is showing the following code: 16#81E2  Frame aborted: Character frame error  Check the settings for start bit, data bits, parity bit, data transmission rate, and stop bit(s).  I don't know how to solve it from now on... could you help me?

sorry about my English

your words:

I will only use Receive_p2p to read the data received from the Modbus RTU device.

This is problem. Modbus RTU protocol is simply send of request and wait for answer from Slave. Your system will not work with only wait to message, this isn't system of cyclical send message system as some sensors can use. So again important question - is your protocol exactly Modbus RTU? Pls understand that this Topic was about to create MB RTU own protocol probably so hope you understand (very sry I'm afraid not) what is matter here. This is not easy procedure for programming especially if your card doesn't support MB RTU protocol as I good see.

Look, if your answer is still that you want prepare own MB RTU driver, I recommend then check www.simplymodbus.ca where all is described, simply I expect you'll have quite lot of work to do