Sierra Video SCP-20 - Manual (Page 15)

SCP-20
9
The RS-485 Network
Once the panels DIP switch settings are compatible with the system (i.e. each panel has its own
unique ID number), the panel can be connected to the RS-485 network.
The panel has two mini XLR connectors. The mating connectors used are Switchcraft TA3F. If
these are not available locally, they can be purchased from Sierra Video. The cable entry hole
into these connectors is quite small and we have found that Belden 8451 cable fits quite well
through the strain relief.
The pinout of the connector is as follows:
Pin 1………RS-485 +
Pin 2………Ground
Pin 3………RS-485 –
The two connectors on the back of the control panel are connected in parallel. This allows the
panels to be looped (“daisy chained”) together. If it is more convenient, you can build a fanout
panel or box so that only one cable needs to run to each panel. In either case, the total cable
length cannot exceed 5,000 feet at 31,250 baud or 10,000 feet at 9,600 baud.
Installation
Once the DIP switch settings have been set to your system requirements, connect the panel’s
control cable (RS-485) to the router and apply power to the panel.
Upon power up the panel will display a series messages. The first message displayed will read
“Power On Tests Successful” followed by “Starting Application Please Wait…”. The next
message displayed will read “Contacting Router, Please Wait…” on the top row. The bottom
row reads “804020” (the panel’s part number) “ID:xx” (the panel’s ID number) “Speed:xxxxx”
(panel port speed) “Sftwr: Vx.xx” (current software version).
* If the display stays on the “Contacting Router…” message, it is an indication that there is no
communication with the router. Check the RS-485 cable for correct connection.
If communication with the router is correct the panel will display the following message, “Sorting
Router I/O Names… Please Wait…” at this point the panel is retrieving the input and output
names from the router’s processor.
If the router name, number of inputs or outputs is different than what is stored in the panel’s flash
memory, the message “Router Name or Size changed Erasing Flash, Resetting Panel…” is
displayed.
After these initial functions are complete, the panel will display its main control screen. The panel
is now ready for programming.
Note:
Each panel in a system MUST have its own unique ID number.
Power
9 vdc
RS-485
Looped
Connectors