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SERVSWITCH™ DUO AND SERVSWITCH™ QUADRO
5.10 Switching Channels by Sending RS-232 Data
NOTE
This type of switching is intended for use in fully automated systems
only. Avoid using this type of switching when you also have human
users switching from their user stations—the results could be
unpredictable.
You can switch the ServSwitch Duo/Quadro remotely by sending RS-232 data to the
COMM port on the Duo’s/Quadro’s rear panel (next to the power connectors).
The Duo/Quadro can use this port for serial communications. To send the Duo/
Quadro switching commands that can affect any user:
• Run the included DB9-male-to-DB9-female serial cable from the COMM port
to a DB9 male serial (COM) port on your PC or other RS-232 device.
• Set your PC or RS-232 device to transmit at 19,200 bps using 8 data bits, 1 stop
bit, and no parity. (No handshaking is implemented or supported, but valid
command characters will be echoed back to the sender, and the DTR, DSR,
and CTS lines will always be held high.)
Each switching command is one byte long. The top nibble (first 4 bits) identifies
the user to be switched: from hex
1
(binary
0001
) for the user on user port #1 to
hex
4
(binary
0100
) for the user on user port #4. The bottom nibble (second
4 bits) identifies the computer port to which you want the Duo/Quadro to switch
that user: from hex
0
(binary
0000
) for the CPU on CPU port #1 to hex
F
(binary
1111
) for the CPU on CPU port #16. Here are some complete commands:
• Send hex
14
(binary
00010100
) to switch user port #1 to CPU port #5.
• Send hex
38
(binary
00111000
) to switch user port #3 to CPU port #9.
• Send hex
4D
(binary
01001101
) to switch user port #4 to CPU port #14.
In addition, you can use four special commands to switch the user ports to the
nonexistent CPU port #0: from hex
71
(binary
01110001
) to switch user port #1 to
CPU port #0 to hex
74
(binary
01110100
) to switch user port #4 to CPU port #0.
This type of switching is always done in “shared use” mode rather than “exclusive
use” or “video only” (see
Section 5.11
). If you attempt to switch a user to a CPU
port that’s already being exclusively used by another user—which shouldn’t
happen in an automated system—the attempt will fail, although the Duo/Quadro
won’t indicate that fact on the serial port. Obviously the commands that affect user
ports #3 and #4 will have no effect on a ServSwitch Duo. These serial commands
affect only the CPU ports on the directly attached Duo/Quadro; they can’t be used
to switch to CPU ports on other chassis in a cascaded system.
For a brief discussion of the COMM port and an illustration of its pinout, see
Section A.3
in
Appendix A
.
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