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1 INSTALLING THE RS-422-A INTERFACE
1.1 Interface Specifications
Chapter 1 INSTALLING THE RS-422-A
INTERFACE
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:
• read measured values,
• read parameters, and
• set parameters.
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: 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
Transmission speed: 1200, 2400, 4800, or 9600 bits/s
Start bit: 1 bit
Stop bit: 1 or 2 bits
Parity: Even, odd, or none
Word length: 7 or 8 bits
Electrical signal characteristics: EIA standard electrical characteristics for the
interchange signals and associated circuitry.
Functional isolation.
Communication distance: Up to 500 meters (between an isolated line converter
or an isolated-output computer and a VR200 recorder)