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[ 3 ] Interface Specifications
CU-401
RS-232C interface port (Dsub-9P) on the CU-401
Pin No. Signal Functions
Signal Input/Output
CU-401 External device
2 RD Receive data ←
3 SD Send data →
4 ER Data terminal equipment ready →
5 SG Signal ground ―
6 DR Data set ready ―
7 RS Request to send ―
8 CS Ready to send ―
Shown below is a diagram of the internal connection in the CU-401.
CU-401
BHT
CU-421
The USB interface on the CU-421 is USB1.1 (Full-speed) compliant with a type-B receptacle.
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