Omega Speaker Systems VR200 instruction manual Communication Wiring, Data Configuration

1.3 Communication Wiring

1.3 Communication Wiring

If the host PC is equipped with an RS-422-A interface, the VR200 can be connected directly. If the host PC is equipped with only an RS-232-C interface, the VR200 can be connected using a converter (SHARP model Z-101HE or equivalent).

Shown below are two wiring examples, which are the same except for the case shielding. If there will be a connection between different panels, wiring method b should be used.

Personal

computerConverter Z-101HE

(SHARP)

R*

a

R*

Personal	Converter
computer
	Z-101HE
	(SHARP)
	R*
b

R*

* R in the figure denotes the terminal resistance.

R:100W, 1/2 W or greater (adjust according to the impedance. The converter shown above is the inverter type. The + and - polarity depends on the type of converter.)

Figure 1.3 Communication Wiring

In case a, use two pairs of 24 AWG (minimum) twisted shielded cables or the equivalent. In case b, use three pairs of 24 AWG (minimum) twisted shielded cables or the equivalent. The extra pair is used for SG in case b. (Characteristic impedance: 100

Ω, capacitance: 50 pF/m)

Keep the terminated unshielded section to a minimum and clear of the VR200 recorder ground line.

To prevent an electric shock, ensure that the main power supply is turned off.

1.4 Data Configuration

The signal is determined by the potentials of RS-422-A terminals A and B, as follows:

1 INSTALLING THE RS-422-A INTERFACE

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