Check Settings
Welcome to the wonderful world of serial data. First of all, check your serial comm settings. Make sure you match up on both ends. I'm talking number of data bits, parity and baud rate. Since it sounds as though you are recieving something, I won't go to the hardware. Usually with this type of serial comm, you will do some sort of read statement in the PLC. There are probably several ways to set this up. Usually a termination character is used to flag the end of the string. Sometimes, if the string is always the same length, you can terninate on number of characters. The PLC must know where the end of string is so it can place the correct ascii info in the proper registers. If you have more information, it would be helpful.
Tech7