User guide

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10
Channel switching by external control
The OPTIONS port featured on every AV4PRO-DVI 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Appendix 2.
OPTIONS port pinout
TheOPTIONSportcanaccepteither8p8cor10p10cconnectors,asrequired.
4
5V
2A
USER
CONSOLE
OPTIONS
To connect a computer or device for remote control
1 Insertthe8p8cor10p10cconnectorofthecabletotheOPTIONS port on the
rear panel of the unit.
Control by RS-232 serial
WheretheexternalcontrolisviaRS-232signal,ensurethattheconguration
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 option in the Configuration menu
• Databits: 8
• Stopbit: 1
• Parity: None
Serial port channel selection codes
ASCII
Character Hex Decimal
• Channel1: ‘1’ 0x31 49
• Channel2: ‘2’ 0x32 50
• Channel3: ‘3’ 0x33 51
• Channel4: ‘4’ 0x34 52
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-DVI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3: Channelselectinput3 low
• Channel4: Channelselectinput4 low
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.
8p8c 10p10c Signal
  1 Channelselectinput1
 1 2 5VDCpoweroutput(100mAmax)
 2 3 GNDreferenceforallsignals
 3 4 RS232(RXD)datareceive
 4 5 RS232auxiliarydatatransmit(reserved)
 5 6 RS232auxiliarydatareceive(reserved)
 6 7 RS232(TXD)datatransmit
 7 8 Channelselectinput2
 8 9 Channelselectinput3
  10 Channelselectinput4
1
10
OPTIONS
2 Connecttheotherendofthecabletoavacantserialportonthecomputer
or to the output of the switching device.