I have an Ikegami IK8046 camera switcher that I am controlling with a Nevo Q50/nevoconnect via Rs232.  I have no trouble sending basic commands, but there are a few functions that require me to send two commands at the same time in order to work.

this is part of the manual:

Quad Screen display:     E
CH 1:                           A
CH 2:                           B
CH 3:                           C
CH 4:                           D
VCR/LIVE:                    G
KEY LOCK*2:                H
SETUP MENU*3*            GH

*2  Computer has to send out command code "H" continuously for 2 seconds to switch the device between security lock ON and OFF mode.  If any alarm is activated under security lock ON mode, the device has to send out command code "H" continuously for 4 seconds to clear alarm.

*3  Setup menu is switched ON by sending VCR/DVR and Lock button codes together.


So my question is, how do I make *2 and *3 happen?


if it matters:  1200 baud rate, 8 data bit, 1 start bit, 1 stop bit, and no parity