HLSB38-IO32A User's Manual
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4 Functions
This chapter describes functions of HLSB38-IO32A.
Fig. 4-1 Input equivalent circuit
4.1 MKY38-IO32A（HLS slave device）
This board mounts MKY38-IO32A chip, slave IC for HLS.
MKY38-IO32A can control 16 bit inputs / outputs as external I/O.
Also, general-purpose outputs have low-pass filtering function.
4.2 HLS communication
HLSB38-IO32A equips RS485 transceiver （SN65HVD33D） and pulse transformer （SPT401-DMX） for HLS
communication.
Full-duplex or half-duplex communication mode can be selected with switching SW3 and SW4.
Termination resistor (100 Ω ) can be set enable / disable with DIP switches (SW5, 6).
4.3 General-purpose inputs
HLSB38-IO32A supports 16 general-purpose input signals. Each input signals are isolated by photocoupler and
connected to HLS slave IC （MKY38-IO32A）. The input method is current source type, which can be connected to
switches and sensors.
Input equivalent circuit diagram is shown in Fig. 4-1.
