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220 / March 2000
O U T P U T M O D U L E
Serial Interface
Using the Serial Interface
The 220 Serial Interface is designed to support serial communica-
tions under the RS-422/485 and -232 protocols. The proper serial
interface protocol must be selected (via jumpers on the OMD-220
module) or else serial communications will not function correctly. No
serial interface connections are required for normal, stand alone
operation of the 220 console; in fact the console will work normally
with an improper connection to the serial interface. The function of the
serial interface is to enable remote operation of the 220 console
functions; local operation of the console switches and faders will
always override any remote commands that may have been sent via the
serial interface. In addition, the LOC/REM button on the OMD-220
module can be used to disable any serial communications with the 220
console. Toggling the switch “ON” and “OFF” alternately enables and
disables the serial interface port on the 220 console. The
pushbutton LOC/REM switch lights when the serial interface is active.
Remember, the 220 console can always be controlled by its faders and
switches regardless of the status of the serial interface. If remote control
of the console is desired, the “remote” mode must be selected with the
LOC/REM switch.
The most common use for the 220 Serial Interface is to allow
configuration changes (mutes, tallys, etc.) by means of the “Virtual Dip
Switch” program supplied with the console and described in Chapter
6 of this manual. To do this, the “Virtual Dip Switch” program must
first be installed on a suitable PC, and a serial cable connected from the
COM port of your PC to the DB-15 connector on the OMD-220
module. Be sure that the RS-232 mode for the console serial interface
(the default setting) has been selected via the jumpers on the OMD-220
module. Push the LOC/REM button to enable remote operation and
start the program on the PC. Use the program as described in this
manual to modify the 220 console configuration. Once the configura-
tion has been set, the PC can be disconnected from the console.
Another use for the 220 Serial Interface is for complete remote
operation by an external control system. When used in this way, the 220
console acts as a passive listener to the serial interface awaiting serial
protocol commands. Any external system that can deliver serial text
strings in the proper serial protocol format will be able to control the
console. Consult Auditronics Technical Support for more details on
enabling this functionality.
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