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Installation Tank Gauge Transmitter
6 Installation and Operations Manual
Figure 2-3: ATT Field Terminal Block Wiring
2.4.4 Connecting Host Communication
The procedure used to wire the ATT to the host computer depends on the type of host interface option ordered with
the ATT.
Terminal Block One TB1 Terminal Block Two TB2
1 L+ = ATTI expansion Bus +
power
12 S = Space or EIA485 +
2 HPORT = ATTI bus HART Signal 11 M = Mark or EIA485 -
3 L- = ATTI expansion Bus -
power
10 B + = ATT + power
4 C = RTD C lead 9 B - = ATT - power
5 B = RTD B lead 8 -- = Reserved
6 A = RTD A lead 7 -- = Reserved