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Channel switching by external control
The OPTIONS port featured on every AV4PRO-DP allows external control of the
current channel either by the optional RC4 controller, commands sent via RS-
232 serial input or by switching one of the four channel select input lines. For
more details about the necessary RS-232 serial cable, see
OPTIONS port pinout
The OPTIONS port can accept either 8p8c or 10p10c connectors, as required.
1
10
8p8c
10p10c
1
2
3
4
OPTIONS
5
6
7
8
10
To connect a computer or device for remote control
1 Insert the 8p8c or 10p10c connector of the cable to the
rear panel of the unit.
U S
U S
E R
C O
E R
C O
N S
N S
2 Connect the other end of the cable to a vacant serial port on the computer
or to the output of the switching device.
Appendix
1.
Signal
1
Channel select input 1
2
5VDC power output (100mA max)
3
GND reference for all signals
4
RS232 (RXD) data receive
5
RS232 auxiliary data transmit (reserved)
6
RS232 auxiliary data receive (reserved)
7
RS232 (TXD) data transmit
8
Channel select input 2
9
Channel select input 3
Channel select input 4
port on the
OPTIONS
O L
O L
E
E
4
O P
T I O
N S
Control by RS-232 serial
Where the external control is via RS-232 signal, ensure that the configuration
menu option
is set to
or
to enable RS-232 control.
Serial port parameter settings
Ensure that the chosen serial port is configured to the following:
• Baud rate:
To match setting of
• Data bits:
8
• Stop bit:
1
• Parity:
None
Serial port channel selection codes
ASCII
Character
Hex
• Channel 1:
'1'
0x31
• Channel 2:
'2'
0x32
• Channel 3:
'3'
0x33
• Channel 4:
'4'
0x34
Note: As each channel is chosen using the above RS-232 commands, the
peripherals that will be transferred are determined by the current setting of the
switching mode.
Control by channel select input lines
Where the external control is via the four channel select input lines of the
OPTIONS port (see pin out opposite), ensure that the configuration menu option
is set to
to enable the input lines.
The four input lines are suitable for connection to dry contacts or open collector
style outputs. Connecting an input line to GND will cause the AV4PRO-DP to
switch all of its functions to the selected channel:
• Channel 1:
Channel select input 1 low
• Channel 2:
Channel select input 2 low
Channel select input 3 low
• Channel 3:
Channel select input 4 low
• Channel 4:
If the input line is held low then all other switching requests by other means will
be ignored until the line returns to a high (open) state.
If more than one logic input is low (closed) then the lower channel number takes
priority.
Note: The input lines have only limited protection against over voltage.
Configuration menu
option in the
Decimal
49
50
51
52
10
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