i am very new to ace3600 and maple systems Oit4185 i've been trying to establish communication using Modbus protocol (via RS-232) and i always get an error from the OIT4185 "can't connect to PLC, retry in Progress" and on the ace3600 i get error #827 "first y-coordinate out of range" and also error #825 "Data type Mismatch". I tried everything i can think of but no success. Please help!!!