8315 L&J Tankway Interface Module TankGate Interface
18 Installation and Operations Manual
COM: Communication between the TankGate and the host computer
TXD: Transmitting data to tank gauge
RXD: Receiving data from tank gauge
+5V: Indicates interface module power
+VEXT: Indicates external power

Figure 3-5: Model 8315 LED Indicators

3.2.3 External Power Connector (+48V) (J2)
Connect the +48 VDC External Power as shown below:

Figure 3-6: External Power Connector

3.2.4 Surge/Shield Ground Connector (J4)
Connecting the Surge/Shield ground connector
Caution! This ground connection is important for system safety.
Connect a 14 AWG copper wire between the ground terminal (J4) and a good
earth ground. Perform this step before connecting ANY other wires.
Verify that the resistance in this connection does not exceed 1 ohm.