Kramer Electronics VP-88K - Manual (Page 15)

Connecting the RGBHV/Balanced Audio Matrix Switcher
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Figure 5: Wiring an Unbalanced Stereo Audio Output
Figure 6 illustrates how to wire an unbalanced source to the balanced input on the
VP-88K.
Figure 6: Wiring an Unbalanced Source to a Balanced Input
6.2 Connecting to the VP-88K via RS-232
You can connect to the VP-88K via an RS-232 connection using, for example, a
PC. Note that a null-modem adapter/connection is not required.
Figure 7: Connecting to the VP-88K via RS-232 using a PC