Customer Interface; Analog Output; Relay - Vaisala Spectracap OMT355 User Manual

Chapter 5 ________________________________________________________________ Operation
NOTE
VAISALA _______________________________________________________________________ 47
4. After the driver has been installed, connect the USB cable to a USB
port on your PC. Windows will detect the new device, and use the
driver automatically.
5. The installation has reserved a COM port for the cable. Verify the
port number, and the status of the cable, using the Vaisala USB
Instrument Finder program that has been installed in the
Windows Start menu. The reserved ports are also visible in the
Ports section of the Windows Device Manager.
Remember to use the correct port in the settings of your terminal
program. Windows will recognize each individual cable as a different
device, and reserve a new COM port.
There is no reason to uninstall the driver for normal use. However, if
you wish to remove the driver files and all Vaisala USB cable devices,
you can do so by uninstalling the entry for Vaisala USB Instrument
Driver from the Add or Remove Programs (Programs and Features
in Windows Vista) in the Windows Control Panel.

Customer Interface

OMT355 transmitter has a nonisolated two wire RS-485 serial port for
customer interface use. According to the standard, you can loop up to
32 transmitters for 1 km, by using just one twisted pair. The system can
request oxygen data by polling addressed transmitters.

Analog Output

OMT355 transmitter has a nonisolated current output. The analog
output is configured according to order either from 0 or 4 to 20 mA.
Also fault states are determined at order time. All of these parameters
can later be updated by the customer through Service Interface.

Relay

OMT355 transmitter has one contact relay. It can be configured at order
time to operate as a level indicator or only as a device failure indicator.
These functions can also be updated later on.
The contact relay is of a non-latching type.