Varec 4000 - Manual (Page 71)

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4000 Optional Interfaces
10 Optional Interfaces
Our intent with these optional interfaces is enabling the ATT to coexist along side older VAREC style and competitor
gauging systems and transmitters. This allows the user upward migration to modern gauging systems such as the RS-
485 signal interface utilizing the MODBUS register set protocol. When ready to migrate to modern systems, a simple
exchange of the ATT communications module is required.
10.1 4000TIFMO
This option is compatible along side TIWAY™ transmitters. Although the ATT can coexist along side all of the TYWAY™
transmitters, the communication option is restricted to the HDLC Link Level Protocol, utilizing IT111 primitives. The
ATT is also compatible "user selectable" with an earlier version of the TYWAY™ protocol "CIM".
The ATT has user selectable configuration jumpers to apply 120-ohm termination in case maximum baud rates and
wiring distances are implemented.
This ATT option is compatible to utilize the companion products Model 4040 Tank side Display and the Model 4050,
4 channel Digital Input and outputs.
10.2 4000GEFMO
This option is compatible along side GSI / L&J transmitters. Although the ATT can coexist along side any current loop
mode transmitters, the communication option is restricted to the GPE Level Protocol format. This format utilizes what
we refer to as short and long data responses regarding level, temperature, and status. Because of the nature of this
protocol the temperature range of the RTD is limited to -200ºC to +200º C.
10.3 4000LJFMO
This option can co-exist with L&J Tankway™ Host gauging system and `transmitters. Basically it is a signal format
similar to RS-232, however signal voltage levels are in the 0 to 35 VDC range. Basic user selectable baud rate, stop
and parity bits. Transmitter address is selectable between 1 and 127; protocol is simple in nature of 2 bytes up and 2
bytes back. Response data consist of product level and temperature, encoder gray code and 2 status bits for error
checking and data validity.
10.4 4000MXFMO
This option can co-exist along side VAREC style matrix transmitters. As implied a transmitter is selected actively by
either the 48-volt or the common line in the matrix. When selected 3 milliseconds later the transmitter sends the level
data over the Mark Space data lines. This is refereed to as hard wire logic, which occurs only once when selected, it is
as if the transmitter is asleep only to wake up send data and go back to sleep. There are no communications
parameters to select because only 1 transmitter can be triggered in the matrix at one given time.