APPENDIX D: RS-485 COMMUNICATION
LW500A/LW600A PULSED Nd:YAG LASER
D-2 990-539
Half-Duplex (Multi-drop) Configuration (RS-485) – Connecting Multiple Lasers Together
NOTES:
The Unit # (Laser Unit address) is set on the Initialization Screen under NETWORK #. To avoid
communication conflicts, each Laser needs its own unique Unit # (Laser Unit address).
For the MLE-116A Program box: see Chapter 3, Section III, Initialization Screen.
The RS-232C/RS-485 conversion adapter is not supplied with the Laser.
There is a 120Ω termination resistor located on each Main CPU Board. When daisy chaining
multiple Lasers together, only the last Laser in the chain needs to have the termination resistor “in
circuit”. All other Lasers should have the TxD Resistor set in the OFF position or removed.
– ME-1958 Main CPU Board – dipswitch SW3-1 (ON = in circuit, OFF = out of circuit).
– ME-3024 Main CPU Board – dipswitch SW3-1 (ON = in circuit, OFF = out of circuit).
Half-Duplex Schematic
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