Pelco Manual C573M-D (11/03) 7COMMUNICATION PORTS SETUP
There are two sets of DIP switches inside the MDA for selecting the type of interface for the
communication ports (COM 1 and COM 2).
The unit comes from the factory configured for RS-422. If your communication scheme is
RS-422 and you intend to program the MDA(s) through a CM9760-KBD, KBD200A or
KBD300A keyboard, leave the settings alone.
However, if the communication scheme is different than RS-422, or you are going to
program the MDA through a PC (which requires RS-232), do the following to change
settings. (Generally, programming through a PC is easier than programming through a
System 9760 keyboard. For more information, refer to the
Programming
section.)
1. Remove the 10 screws on the top cover and lift it off.
2. Refer to Figure 2 for the location of the switches for COM 1 and COM 2. Refer to
Table A for the switch settings.
3. Replace the cover.
NOTE:

COM 1 is config-

ured at the factory for

RS-422 communication. To

communicate via RS-232,

you must open the case and

change an internal DIP

switch.

Figure 2. Location of DIP Switches

Figure 3. DIP Switch

Table A. Port Setup Switch Settings

2134567 8
ON SWITCH SETTINGS PORT SETUP
1234567 8 SELECTED
OFF OFF OFF OFF ON ON OFF OFF RS-232 Operation
ON ON ON ON OFF OFF OFF OFF RS-422 Operation*
ON ON ON ON OFF OFF ON OFF RS-485 Operation
* Factory default setting
FRONT
BACK
UNIT ID DIP SWITCHCOM 2 COM 1
FUSE
COM 1 DIP SWITCH
COM 2 DIP SWITCH