Denso BHT-604BW User Manual page 162

BHT-604BW
5.1 Connector Communication(RS-232C Interface)
The BHT-604BW is equipped with a connector interface used to communicate with other devices.
5.1.1 Interface Connector and Pin Assignment
Connector interface : JC-25-J-3A (ø2.5 mm stereo mini jack)
Connector pin:
Signal Name
SD
RD
SG
Signal Voltage Input/Output Level
Signal
0
1
 Note 
The BHT connector port is not designed for frequent cable insertion and removal.

Repeatedly inserting and removing the cable more than once a day will result in a shortening of
the connector port lifetime, and therefore IrDA communication (CU-600 Series, IrDA device etc.)
should normally be used.
Allow the specified signals only to enter the connector interface port. Entry of other signals will

result in a failure or malfunction of the BHT.
148
JC-25-P3 (ø2.5 mm stereo mini plug)
SD RD GND
Function
Send data
Receive data
Signal ground
Input Voltage Threshold (RD)
3V min.
-3V max
Signal Input/Output
BHT External device


—
Output Voltage Threshold (SD)
5V min.
-5V max.