Denso BHT-400B-CE - Manual (Page 167)

Chapter 5 Handling the CU-400 (Option)
5.6 Interface Specifications
[ 1 ] Interface Connector and Pin Assignment
CU-401
The CU-401 has an RS-232C interface port (Dsub-9P).
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 —
The input/output voltage threshold for the logical valued signal is listed below.
Logical Value Input Voltage Threshold Output Voltage Threshold
0 3V
≤ n ≤ 15V
5V min.
1 -15V
≤ n ≤ -3V
-5V max.
CU-421
The CU-421 has a Full-Speed USB 1.1-capable port (Series B receptacle).
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