RLE LD5100 - Manual (Page 20)

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2 Connections and Settings
2.1. Main Board
The connectors on the main board, found at the bottom of Figure 2.1, are labeled TB2 through
TB7. The connector on the power board is labeled TB3. The reset switch on the main board is
labeled SW1. The termination setting on the main board is labeled SW2.
2.1.1 SW1: Reset Switch
The Reset switch is provided to reset the microprocessor without cycling power to the unit.
2.1.2 SW2: Termination Setting
The Termination Setting switch must ALWAYS be set to the far right. This enables the RS232
port to work properly.
2.1.3 R39: Contrast
This adjustment knob adjusts the 160x160 LCD's contrast. Turn the adjustment knob
clockwise or counterclockwise to adjust the contrast as necessary.
2.1.4 TB1: Input Power
This is a factory wired two position connector with the following connections (for reference
only):
TB1-1 24VDC negative (-)
TB1-2 24VDC positive (+)
2.1.5 TB2 and TB3: RS485 Modbus Port 2 and 1
Terminals TB2 and TB3 connect to a RS485 network. A grounded shield contact is provided
for connection to shielded cable. If the shield contact is used, verify the power connector is
properly grounded and there is no voltage potential between units on the network. The RS485
ports are set to no parity, 8 databits, 1 stop bit (n, 8, 1). Connect the RS485 wires to TB2 or
TB3 on the main board as follows:
TB2-1 A (+)
TB2-2 B (-)
TB2-3 Shield