The System 8 RS232 works fine with a null modem. No intercharacter delays needed but you do need a 100ms (smallest available in RT) after each command. If you are using a System 8 and an V883 or a System 12 you can chain the systems together with a straight m-f serial DB9 serial cable and save a port on your RP-6, XP-8. We have used all these devices extensively with RS232 and have had no problems.

Volume tracking is a bit slow so we repeat the command with the delay 3 times via a system macro. It is a bit tedious to configure the macros but once you have them setup they work quite nicely in this environment.