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16 VA-8xl - Controlling the VA-8xl
6.3.3 Connecting the RS-485 Control Interface
To connect an RS-485 connector on one VA-8xl unit to an RS-485 connector on
another unit:
1. Connect the “+” PIN on the first VA-8xl unit to the “+” PIN on the second
VA-8xl unit
2. Connect the “-” PIN on the first VA-8xl unit to the “-” PIN on the second
VA-8xl unit
3. If shielded cable is used for an RS-485 connection, connect the shield to the
Ground PIN.
Figure 12 illustrates the RS-485 line that connects:
• Between each VA-8xl unit
• To the PC via a Kramer Tools VP-43xl Interface Converter
(connect the PC’s 9-pin D-sub COM port to the “RS-232 in” 9-pin
D-sub (F) port on the VP-43xl. Next, connect the RS-485 port on
the VP-43xl to the RS-485 ports on the VA-8xl units)