Instruction manual

63
4000 Optional Interfaces
10 Optional Interfaces
The intent of the optional interfaces is to enable the ATT to co-exist 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
co-exist 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 Digital I/O Unit.
10.2 4000GEFMO
This option is compatible along side GSI / L&J transmitters. Although the ATT can
co-exist along side any current loop mode transmitters, the communication option is
restricted to the GPE Level Protocol format. This format utilizes what is referred 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. The baud rate, stop, and parity bits are user-selectable. The
transmitter address is selectable between 1 and 127; the protocol is simple in nature
consisting 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, the transmitter sends the level data over the Mark Space data lines 3
milliseconds later. This is referred 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 one transmitter
can be triggered in the matrix at a given time.