
Optional Interfaces
Tank Gauge Transmitter
64
Installation and Operations Manual
10.5 4000WBFMO
This option can co-exist along side Whessoe Bus™ transmitters, the signal format is a
current loop style transmission signal. The transmitter address is user-selectable
between 1 and 127 with basic baud rates, stop, and parity bits. The protocol is referred
to as Whessmatic 550, which was widely used by the UK for their Intelligent Tank
gauging systems. The ATT meets and exceeds the requirements of the Whessmatic 550
format because of its redundant dual port capabilities and the bipolar signal circuitry
design. The advanced circuitry allows the ATT to communicate without error at 9600
baud through 2 data ports simultaneously. A typical transmitter using current loop
signal format nominally communicates at 300 to 1200 baud at maximum.
10.6 4000GMFMO
Basically, this is identical to the standard release of the 400048FMO, a MODBUS Protocol
device communicating over RS-485 data lines. GSI, a tank gauging systems
manufacturer has re-mapped level and temperature integer registers to non-standard
MODBUS locations. This version of ATT allows it to co-exist along side GSI transmitters
and gauging systems with response data as expected.
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