LevelMaster 7100 User manual 2105835 Rev AA | 23Figure 19: Removing terminal connectors (2104836-001)Onboard LEDs (2104836-001 boards only)For electronics boards, part number 2104836-001 or later, onboard LEDs provide visual indication that help troubleshoot theconnections to the power and communication ports (right board in Figure 18):LED D19 and D18, located below the COM (RS-485) port, are used to indicate when data is being transmitted or receivedon the port. The D18 LED flashes to indicate that a packet has been transmited. D19 flashes to indicate that a poll requesthas been received.LED D9, located below the Power port, is used to indicate reverse polarity when lit.Onboard termination jumpers (legacy boards only)For electronics boards, part number 2018546-005 only, onboard jumpers (JP1 in Figure 20) provide a way to configure theLevelMaster for connection to additional LevelMasters on an RS-485 bus. Figure 20 shows the placement of the JP1 jumpersdepending on the position of the LevelMaster on the bus.Figure 20: RS-485 termination for legacy board (part number 2018546-005)IMPORTANT NOTE: The MasteLink cable will not operate with the fourth jumper installed (pins 7-8 jumpered on theonly or last sensor). Remove this jumper when connecting directly to the electronics board for local communication(during configuration). Once configuration is complete and local communication is terminated, the jumper can beplaced again as required for the terminating sensor.T+ T+ T- T-+ -RS485PORTPOWERPORTREMOVETERMINALCONNECTORS
