
8303
Varec, Inc.
45
5.1.2
Application
The Varec 453x series Average Temperature Converter (ATC) (AT4530) point must communicate
via a Varec 6000 Servo Tank Gauge or a 4590 Tank Side Monitor (TSM). All communication
parameters such as ID, Chan, BaudRate, etc., must be set to communicate to the SG6000 or
4590 TSM. Once communication is established through the SG6000 or 4590 TSM, the AT4530
point then automatically retrieves all data. The AT4530 point can operate using one of three
protocols:
Modbus Protocol
Using Modbus protocol, AT4530 temperature transmitters are connected to a Varec 6000 Servo
Tank Gauge or a 4590 Tank Side Monitor. The Varec 6000 Servo Tank Gauge or 4590 TSM is
connected to an 8203 Dual RS-485 Communications Interface Module (Modbus). 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 to
which 8203 Dual RS-485 Communications Interface Module channel the Varec 6000 Servo Tank
Gauge/4590 TSM/AT4530 is connected. The ID must match the Device ID of the Varec 6000
Servo Tank Gauge or 4590 TSM.
General
All three interface methods provide a software interface to the Varec 453x series Average
Temperature Converter (ATC).
8203 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 TempUnits must match the engineering units of the AT4530 temperature transmitter.
Conversion from Metric to English (or vice-versa) can be performed be setting the TempConvert
parameters in the MSCAN, RKSCN or WBSCN point associated with the AT4530 point.
PntStatus
Byte value indicating status of point. Values are:
0x0000: No Error
0x0001: Gauge is offline
0x0002: Data is invalid
0x0004: Command Timeout
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 Error0x40 - Invalid Command0x80 - Motherboard Watchdog
Timeout
PntCheckSum
CRC-16 Checksum for point’s static Configuration Parameters.
WMCheckSum
Weights and Measures Checksum. This parameter is calculated when the WMSeal
parameter is set to enable.
Dynamic Parameters
Function
Содержание 8300 series
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