Communicating from Navision to external device

focalsys

I need some help. One of my clients has some scales attached via serial port to their current server. They need to use these with Navision. I dont know what type of scales they are and do not know if this is important. The scales are quite old and are programable with difficulty. The program is very simple e.g. enter product code, send, then place goods on scale and send weight. I have no idea how to do this with Navision but am sure someone out there has done this before. As far as I am aware the current server sends a string with an id which is interpreted by the scale and reads a string with an id from the scale. Appreciate any help.

Savatage

I'm not really clear. Who's sending what to which?

focalsys

I need to send a string to the scale from Navision and receive back information from the scale. For example the interaction would go something like this
From Navision
"Enter product code"
From the scale
ABC123
From Navision
Enter weight
From the scale
25.6