
8303
Varec, Inc.
93
5.14.2 Application
The 4590 TSM can operate with a variety of protocols including: L&J Tankway, Modbus, Mark/
Space, or Whessoe Bus. However the TM4590 point is only used when communicating via
Modbus or Whessoe Bus.
Modbus Protocol
Using Modbus Protocol, 4590 TSMs are connected to an 8303 Dual RS-485 Communications
Interface Module configured with Modbus firmware. An MSCAN point is automatically created to
GaugeStatus
Coded value indicating status of the gauge. The GaugeStatus can have the
following values:
Upper Int Level - Searching or following the upper interface level.
Mid Int Level - Searching or following the middle interface level.
Bottom - Searching or following the bottom.
Following Level - Displacer is following product level.
Calibration Act – Automatic gauge calibration is in progress.
Bottom Density – Measuring the Bottom Density.
Middle Density – Measuring the Middle Density.
Upper Density – Measuring the Upper Density.
Raising – The displacer is raising.
Stopped – The displacer is stopped.
Rel Over Tens – The displacer cable tension has exceeded the maximum value.
0x1 - Gauge Servo bit 0
0x2 -Gauge Stowed bit 0
0x4 -Stow Received on Port 1 bit 0
0x8 -Stow Received on Port 2 bit 0
0x10 - NOVRAM corrupted bit 0
0x40 - Multi-element Thermometer fitted
0x80 - Element 1 Selected
0x100 - Element 2 Selected
0x200 - Element 3 Selected
0x400 - Element 4 Selected
CustodyMode
Weights & Measures Status
Elapse
Time of last scan.
Interval
Amount of time (in HR:MIN:SEC) between scans of the gauge
PntStatus
Byte value indicating status of point. Values are:
8303 Dual RS-485 Communications Interface Module:
• 0x0000: No Error
• 0x0001: No Response from Device
For 8211 Whessoe Bus Communications Interface Module values are:
0x10 - Gauge is offline
0x20 - CRC Error
0x40 - Invalid Command
0x80 - Motherboard Watchdog Timeout
PntCheckSum
CRC-16 Checksum for point’s static Configuration Parameters.
WMChecksum
Weights & Measures Checksum. This parameter is calculated when the WMSeal
parameter is set to Enable.
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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