Hi,

i need start up hints. firstly, i would like to know if a twido telemecanique PLC uses modbus protocol.

secondly, how can i send commands direct to the PLC through hyperterminal?

i have developed a number of PLC programs for my client. i want to provide him with the means of selecting any one of the programs i have developed for him, change a few parameters like, temperature thresholds and send the selected program to the PLC through GUI.

comments and hints most welcome.

thank you all in advance.

 

> firstly, i would like to know if a twido
> telemecanique PLC uses modbus protocol. <

Yes, it does.

> secondly, how can i send commands direct to the
> PLC through hyperterminal? <

It would be hard to send a Modbus RTU telegram using hyperterminal.

You can take this for communicating to Modbus.
http://www.pvbrowser.org/pvbrowser/sf/manual/rllib/html/classrlModbus.html

For Download: Look at the Main Page.

 

Yes, the Twido controller have Modbus Protocol, depending on model the physical layer could be RS-232 or RS-285, some models have only one port.

You can send ascii characters through the serial port using hyperterminal, you have to establish a connection with COMM1 for example (check the nummer) and type characters. But in order to send a modbus command you have to take care about the silent interval between frames and characters.