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Chapter 1 INSTALLING THE RS-422-A
The option /C3 provides the VR200 view recorder with the EIA (Electronic Industries
Association) RS-422-A communication interface to allow a host computer to do the
following:
However, this interface does not allow the host computer to operate the power switch of
the VR100VR200 nor control the parameters which can only be set in the SETUP mode
on the VR100VR200.
1.1 Interface Specifications
Communication System:
Transmission speed:
Start bit:
Stop bit:
Parity:
Word length:
Electrical signal characteristics: EIA standard electrical characteristics for the
Communication distance:
INTERFACE
• read measured values,
• read parameters, and
• set parameters.
1.1 Interface Specifications
4-wire, half-duplex, multi-drop connection
1:n (1 = host computer and n = VR200 view recorders,
n = 1 to 16)
Start-stop (asynchronous) system
1200, 2400, 4800, or 9600 bits/s
1 bit
1 or 2 bits
Even, odd, or none
7 or 8 bits
interchange signals and associated circuitry.
Functional isolation.
Up to 500 meters (between an isolated line converter
or an isolated-output computer and a VR200 recorder)
1 - 1
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