RS485 port:
The RS485 port is a bi-directional port. It uses RJ12 cable to communicate with the SR4.
RJ12 cable is a 6 conductor (wire), 2 station telephone OR Modem cable. This cable has 6 wires
(NOT 4 wires) with 2 telephone plugs, one on each end. The RJ12 cable is a crossed wire cable.
This means that one of the telephone plug is a reversed image of the other telephone plug. Pin 1 on one
of the plug is pin 6 on the other plug.
To test that the wires are crossed, do the following: Place each plug facing each other and look at the
color of the wires. If the colors of the wires match, then the wires are crossed. This 2 station
telephone/Modem cable is available from Wal_Mart, Radio Shack etc. Or you can build it yourself
using a bulk telephone cable, RJ12 plugs and the crimping tool.
RS485 Communication protocol:
The SR4 can play through the RS485 port. The setting is 9600 baud, 8 bit, N, 1 stop bit.
Using the RS485 port, you can control the playback from a PC or other micro controller, The RS485
command is @0:xx, where xx is the input in the autoplay.txt OR IR command.
Example:
To trigger 020099=Bird.mp3, the command is: @0:2
To trigger 150000=lion.mp3, the command is: @0:15
For IR function PAUSE, the command is @0:PAUSE
For IR function STOP, the command is @0:STOP
For IR function NEXT, the command is @0:NEXT etc.
The IR command is exactly as written on the IR remote keys.
IN6 INPUT BOARD:
The IN6 input board does not require power supply. The 12 vdc power comes from the RS485 port. If
you are using a single IN6 board, use the RJ12 cable to connect the IN side of the RS485 port of the
IN6 board into the SR4’s RS485 port.
If you are using 2 or more IN6 input boards:
Using the RJ12 cable, connect one end into the SR4 and the other end into the IN port of the IN6. To
connect the second IN6 board, use the RJ12 to connect the OUT port of the first IN6 board into the IN
port of the second IN6 board. Make sure to set the IN6 board address correctly.
To connect the third IN6 board, use the RJ12 to connect the OUT port of the second IN6 board into the
IN port of the third IN6 board. Make sure to set the IN6 board address correctly.
To connect the fourth IN6 board, use the RJ12 to connect the OUT port of the third IN6 board into the
IN port of the fourth IN6 board. Make sure to set the IN6 board address correctly.
IN6 INPUT BOARD SETTING:
IN6 board has 2 settings, Normal and IR mode settings.
The setting is determined by JP1 and is indicated by LED #1. To set JP1, remove the top cover and
use the shorting bar either to connect (ON) or disconnect (OFF) JP1.
The setting is as followed:
JP1 is OFF ……. IN6 board is in normal mode.
JP1 is ON …….. IN6 is in IR mode.
IN6 BOARD ADDRESS:
Each board can be set for a board address 1,2,3 OR 4. To set the address, remove the top cover. Locate
jumpers JP2, Jp3 and JP4 behind LED’s D13, D14 and D15.
If JP2, JP3 and JP4 are OFF (no jumper), the board address is 0.
If only JP2 is ON (shorted) board address is 1.
