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Chapter 3 Communications Operations of the BHT
(3)-1 Interface circuit (USB)
USB Driver／Receiver
(3)-2 Interface circuit (RS-232C)
Output circuit Input circuit
TxD, RTS
RxD, CTS
5k
Signal Level
Item Min. Max.
Output voltage “H” (3K load) 5V 15V
Output voltage “L” (3K load) -15V -5V
Input voltage “H” 3V 15V
Input voltage “L” -15V -3V
(Note 1) Input / Output voltages are specified at the terminal of the interface connector.
(Note 2) Output voltage becomes unsettled when the connector communication device file is
closed.
(Note 3) Output voltage shall be under the following conditions:
Power voltage: Rated voltage
Load resistance: 3 k
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