Operating the DVI KVM over IP
Using RS-232
RS-232 under Unicast Mode
In unicast mode, a Sender unit will be able to communicate with only one Receiver unit at a time.
Figure 2.7 - In unicast mode, the host can talk to only one RS-232 device at a time.
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DVI In
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Sender unit
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RS-232 under Multicast Mode
In multicast mode, a Sender unit can communicate with multiple Receiver units simultaneously.
Figure 2.8 - In multicast mode, the host can talk to multiple RS-232 devices.
RS-232 device 
(GTV-AUDDEC-N)
DVI Out
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DVI In
page 29
