Omega Speaker Systems VR200 - Manual (Page 8)

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1 INST
ALLING THE RS-422-A
INTERF
ACE
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.
a
b
Converter
Z-101HE
(SHARP)
Converter
Z-101HE
(SHARP)
Personal
computer
Personal
computer
* 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.)
R*
R*
R*
R*
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:
1.3 Communication Wiring