
8303
Varec, Inc.
61
5.5.2
Application
The MBTX point provides an interface to Varec Model 4000 Advanced Technology Transmitters
(ATT) and the Varec 2900 Float and Tape Transmitter (2900FTT) that operate in Modbus mode.
4000 ATTs and 2900FTTs are connected directly to an 8303 Dual RS-485 Communications
Interface Module. The 8303 Dual RS-485 Communications Interface Module is automatically
detected at startup, and an MSCAN point is automatically created to manage the scanning task.
Chan determines which 8303 Dual RS-485 Communications Interface Module Channel is used
for communications to the slave device. The Chan parameter must match the channel used to
communicate with the 4000 ATT or the 2900FTT. A MBTX point is needed for each device
connected to the 8303 TGI. The ID must match the unit address of the 4000 ATT and 2900FTT.
8303 TGI software points may begin scanning when the point is created, or when the correct
Channel number is assigned. Which of these events begins the scanning process varies with
each point.
The BaudRate and ComParams values must match the communications parameters of the 4000
ATT or 2900FTT. The communications parameters are set as each MBTX point is processed. This
GaugeStatus
Integer value indicating status of the gauge (Integer Register 6). Values are:
0x0001: Bad Level
0x0002: Bad Temp
0x0004: Bad EE
0x0008: Bad EE Checksum
0x0010: Bad RAM
0x0020: Bad EEPROM
0x0040: Local Modifications
0x0080: No Calculation
0x0100: CFG Error
0x0200: Calc Error
0x0400: Bad CPU Board
0x0800: Bad Comm Board
0x1000: Low Encoder Battery
LevelRef
Calibration Level. The LevelRef provides a means to calibrate the level in the
tank gauge trasmitter. Set the LevelRef and then issue a Calibrate command.
PntStatus
Integer HEX value indicating status of point. Values are:
0x0001: Gauge Not Responding
0x0008: Bad Level
0x0010: Bad Temp
0x0020: Bad EE
0x0040: Bad EE Checksum
0x0080: Bad RAM
0x0100: Bad EEPROM
0x0200: Local Modifications
0x0400: No Calculation
0x0800: CFG Error
0x1000: Calc Error
0x2000: Bad CPU Board
0x4000: Bad Comm Board
0x8000: Low Encoder Battery
Elapse
Time of the last scan
PntCheckSum
CRC-16 Checksum for point's static Configuration Parameters
Dynamic Parameters
Function
Summary of Contents for 8300 series
Page 2: ......
Page 6: ...Tank Gate Interface iv Installation and Operations Manual ...
Page 14: ...Overview Tank Gate Interface 4 Installation and Operations Manual ...
Page 50: ...Software Description Tank Gate Interface 40 Installation and Operations Manual ...
Page 52: ...Dual RS 485 MODBUS Software Blocks Tank Gate Interface 42 Installation and Operations Manual ...
Page 56: ...Tank Gate Interface 46 Installation and Operations Manual ...
Page 68: ...Tank Gate Interface 58 Installation and Operations Manual ...
Page 100: ...Tank Gate Interface 90 Installation and Operations Manual ...
Page 112: ...Tank Gate Interface 102 Installation and Operations Manual ...
Page 115: ...8303 Installation Varec Inc 105 s Figure 7 2 Tank Gate Interface Dimensions 197 204 125 ...
Page 148: ...Appendix Order Codes Tank Gate Interface 138 Installation and Operations Manual ...
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