I/O error through RS232 to CD2A

[Angelia]

I'm trying to monitor the CD2A driver through RS232. Unfortunately, since I don't have the right version of the manual, I cannot change nor know what's the baud rate of the instrument. So I tried all possible baud rate. When I try 4800 or 9600, I get an I/O error, and when I try all other baud rate, I get frame error. I think frame error may be due to wrong baud rate. But what does I/O error imply?

Thanks.

[JÞB]

The CD2A serial port settings are configurable so you will need to find out how it is set -up the device is rather old and will be using an archaic command set (It was first introduced to be compatable with an apple III)

A link to a scaned (very degraded) copy of the manual is here

[Angelia]

Thanks for the manual. This is however not applicable to the machine that I'm using. The one I'm using has only 18 elements in configuration setting as oppose to 23, and the first 18 elements don't match that in the manual either. The error code also doesn't all match. Is there any way to figure out the configuration without having to resort to user manual?

Thanks.