(1) While installing Citect did you install Modbus drivers ?
May be NOT, that is why "No serial Drivers error" , reinstall modbus drivers from Citect DVD.
In my folder i dont find modbus driver how can i find it
how can i know if modbus driver installed or not
(2) There are too many devices , ports , etc .
I don't know why that is happened because when i delete device or port is deleted but record number don't decrease.
(3) Network address not specified . Give local IP or 127.0.0.1
Is this important in serial RS232
(4) Enter computer setup editor parameters as shown in screen shot.
Which parameter you mean
(5) Before connecting to SCADA ensure your USBserial cable & PLC comm is OK. PLC node address & parameters are OK.
I checked its ok because i can dawnload programe by ISPSOFT
(6) Dont keep PLC in wrapped condition (overheating).
Than you i run PLC to test communication only .
Best of Luck.
Than you
I use VijeoCitect or else I would have sent backup.
Many thak you for your assistance me