DSM-G600, DNS-3xx and NSA-220 Hack Forum

That looks like it will work fine.

Most likely you can just ignore the RTS & CTS connections - they are part of an older standard and are what are known as "handshaking" signals - RTS (request to send) would be asserted by the DTE (data terminal equipment) which would then wait for the DCE (data communications equipment) to respond with CTS (clear to send) - you should be able to either disable handshaking in your terminal software or just loop RTS back to CTS, so the unit thinks it has gotten a CTS signal at the appropriate time.

When you say LCD are you talking about a full terminal or just a display panel?  Does the display panel support RS232 and can you configure the parameters to match the DNS-323?

That question is probably best answered by someone familar with the LCD - theoretically you should only need the DNS-323's TX pin connected to the LCD's RX pin.

Please be aware that so called RS232 standard serial communications is anything but standard and usually requires more than just compatible hardware and the correct connections, there are a number of parameters - baud rate, stop bits, parity and several different types of handshaking, which can be done in both hardware and software.

Whilst it is possible to get pretty much any two RS232 devices to communicate with one another, it can take quite a bit of fiddling to make it happen and even then if you can get the devices to communicate, if you are unable to configure the one device to send data in a format acceptable to the second device, the results may not be what you expect.

Fortunately or unfortunately, depending on your point of view, RS232 serial communications is largely a thing of the past, and a rapidly dying "black art".