Switching And Monitoring With Serial Devices - Black Box ServSwitch ACL0802A Manual

SERVSWITCH™ BRAND 8 X 2 MATRIX VIDEO SWITCH

4.3 Switching and Monitoring with Serial Devices

You can send the Switch ASCII commands to switch input channels using a
terminal, a PC running a terminal emulator, or some other RS-232 device that can
output ASCII characters. If you're using a PC or other device that can receive
ASCII input, you can also monitor the switching state of either of the Switch's
outputs. (Configure the device to transmit and/or receive at 9600 bps, 8 data bits,
no parity, and 1 stop bit. The ASCII letters in these commands must be entered in
uppercase.)
In a single-head video system: To switch either output port's monitor or other
destination device to display a given input, send the ASCII string "OyIx" followed
by a carriage return, where x is the number of the input port and y is the number
of the output port. (If x is zero, output y is blanked and goes into self-test mode—
see Section 4.4.) For example, to switch output #2 to input #6, send "O2I6
[Enter]".
In a dual-head video system: To switch the output-port monitors or other pair of
destination devices to display a given pair of inputs, send the ASCII string "Ix"
followed by a carriage return, where x is the number of the lower-numbered input
port. (If x is zero, the outputs are blanked—see Section 4.4.) For example, to
display the video from a CPU attached to INPUT 3 and INPUT 7, send "I3
[Enter]". (If you are also using a keypad, the keypad should be attached to
"KEYPAD A" and the serial device should be attached to "KEYPAD B".)
In either single- or dual-head systems: When the switching action is complete, the
Switch will send a copy of the command string, including the carriage return, out
of both KEYPAD ports. (Attached serial devices must be able to either ignore such
strings or react appropriately to them. Any attached keypad will change the state of
its LEDs if a command string affects its output, and will ignore all command strings
that affect only the other output.)
To query the current switching state of either output (particularly at power-up,
which is normally the only time when the output state won't be certain), send the
ASCII string "Oy?" followed by a carriage return, where y is the number of the
output port. The Switch will respond with the string "OyIx [Enter]", just like the
switching command. In a dual-head video system, "O1?" and "O2?" will return the
numbers of the input-port pair: "O1?" will return the number of the lower-
numbered input port (for example, "O1I4 [Enter]") and "O2?" will return the
number of the higher-numbered input port (for example, "O2I8 [Enter]").
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