
Tank Gate Interface
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Installation and Operations Manual
5.13.2 Application
The SG6000 point can operate using one of two protocols:
Modbus Protocol
Using Modbus, SG6000 tank gauges are connected to a 8203 Dual RS-485 Communications
Interface Module configured with Modbus firmware (MDTGx_xx). The 8203 Dual RS-485
Communications Interface Module is automatically detected at startup, and an MSCAN point is
automatically created to manage the scanning task. The Chan parameter determines which 8203
Dual RS-485 Communications Interface Module channel will be used. The ID must match the
Device ID of the SG6000.
Rackbus Protocol
Using Rackbus Protocol, SG6000 tank gauges are connected to a 8203 Dual RS-485
Communications Interface Module configured with Rackbus firmware. The 8203 Module is
automatically detected at startup, and a RKSCN point is automatically created to manage the
scanning task. The Chan parameter determines which channel will be used. The ID must match
the Device ID of the SG6000.
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
PntStatus
Byte value indicating status of point.
8203 Dual RS-485 Modbus Communications Interface Module values are:
0x0000: No Error
0x0001: Gauge is offline
0x0002: Data is invalid
0x1000: Weights & Measure Seal is Enabled
0x4000: Failure of the 8203 Dual RS-485 Modbus Communications Interface
Module. This bit is set if the Watchdog task on the Motherboard determines that
the module has stopped updating.
0x8000: Gauge did not response to last request (pre-fail)
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 Parame-
ters
Function
Summary of Contents for 8300 series
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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 ...
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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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