
8303
Varec, Inc.
53
5.4
Varec Multi-Function Transmitter (Modbus) (MBMFT)
The Varec Multi-Function Transmitter (Modbus) (MFT) Tank Gauge point provides an
interface to Varec 4200 Multi-Function Transmitters (MFT). The 4200 MFT can
communicate using a number of different protocols, including Mark/Space and
Modbus. The MBMFT point interfaces to 4200 MFTs using Modbus. This point
provides level, temperature, density and volume data. Point and gauge status
information is also available in this point block.
5.4.1
Parameters
The database parameters used by the MBMFT point are listed and described below:
Configuration Parame-
ters
Function
Tag
A Tag can contain 15 bytes of data and can include any printable ASCII
character. Tags can be used to identify the name of the tank being monitored.
The default tag is set to “MBMFT.00”.
Chan
Physical channel number the MBMFT is connected to. On the 8203 Dual RS-485
Communications Interface Module, the Chan can be set to 1 or 2. On the 8303
TGI motherboard, the Chan can be set to 1 or 2.
BaudRate
Baud Rate for communications to the Slave device. Valid values are: 1200, 2400,
2400, 9600 and 19200. The BaudRate is set prior to scanning the device. The
default is 9600
ComParams
Defines the number of data bits and the parity used by the com port. Valid
values include:
8N - 8 data bits, No parity
8O - 8 data bits, Odd parity
8E - 8 data bits, Even parity
7O - 7 data bits, Odd parity
7E - 7 data bits, Even parity
The default is ‘8O’.
ID
Physical Address of the tank gauge transmitter (0-999).
Mode
Operation Mode. Valid values are: 0x80: Swap Mode. Swap the order of integer
and floating point values.
LevelOffset
Specified the amount of offset to add to the Level. The default is 0.
TempOffset
Specified the amount of offset to add to the Temperature. The default is 0.
LevelDeadband
Specifies the amount of change in the Level that must occur for the level to be
updated each Change of State period. The default is 0.
TempDeadband
Specifies the amount of change in the Temp that must occur for the
temperature to be updated each Change of State period. The default is 0.25.
Report
Causes automatic notification to the Host (in response to a Change of State
Request) when the Value changes State. Parameter value can be High, Low or
No. Report=No disables notification. Points with Report = High will be sent
before points with Report = Low. The default is High.
Maxtime
Specifies the maximum time (in secs) between automatic Change of State
responses being sent to the Host. Report must be set to either Low or High for
the Value parameter to be sent in response to a Change of State Request. A
value of 0 disables this option. Non-zero values cause responses to be sent
even if the value has not changed since the last message. The maximum is
65535 seconds. The default is 600.
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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