Pelco C1520M-B User Manual
Pelco Manual C573M-D (11/03)
7
COMMUNICATION 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).
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.
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
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.
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.
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
2
1
3 4 5 6 7 8
ON
SWITCH SETTINGS
PORT SETUP
1
2
3
4
5
6
7
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 SWITCH
COM 2
COM 1
FUSE
COM 1 DIP SWITCH
COM 2 DIP SWITCH