Hanyoung TH500 Manual page 17

2.4.5 Digital Input (D.I)
When using open collector, please use as follows : Voltage of both ends should be below
2 V and leakage current should be below 100 ㎂.
● Relay input (D.I of TH300 D.I : 1 ~ 4)
● Transistor input (D.I of TH300 D.I : 1 ~ 4)
2.5 Communtcation connection
2.5.1 RS232C Connection(base on 9pin connector)
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