Varec, Inc. 101
Chapter 6
Bi-Phase Mark
After the 2920 FTT is mounted and wired, it must be calibrated or configured to operate
efficiently and effectively. This chapter contains information about configuring the Bi-Phase
Mark communication protocol, including the following:
• Setting the Unit Address
• Setting Communications Protocols
• Setting the Data Format
• Setting the RTD Type
• Calibrate the transmitter level, including calibrating the level switches and
configuring outputs as outlined in Configuration & Calibration — Level, Limits, and
Outputs.
Basic Parameters
The 2920 FTT requires the setting of several Basic Parameters to enable it to operate in your
particular environment. These parameters are:
• Unit Addr
• Baud Rate
• Lev Com Units
• Temp Com Units
• Gauge Type
• Encoder Direction
• RTD Type
All these parameters are located in the Basic Setup menu. The procedure below details the
steps to set the Unit Addr. and can be used to set other Basic parameters by substituting the
appropriate parameter name for Unit Addr. Of course, the number of times you press Minus
or Plus to access a parameter will be different.
Note The units for transmitting the level and temperature must match the configuration
of the host system. However, the units selected to display the level and temperature on
the LCD can be different than the units used for data transmission. The Lev Disp Units and
Temp Disp Units parameters determine the units used by the LCD display. The Lev Com
Units and Temp Com Units parameters determine the format of the units transmitted to
the host system.
For proper communications, the following parameters must match the setting of the host
system:
• Baud Rate, Lev Com Units, Temp Com Units
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