Denso BHT-6000 - Manual (Page 159)

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5.6 RS-232C Interface Specifications
[ 1 ] Interface Connector and Pin Assignment
The CU-6000 has an RS-232C interface port (Dsub-25S).
RS-232C interface port (Dsub-25S) on the CU-6000
Pin No. Signal Functions Signal Input/Output
CU-6000 External device
1 FG Frame ground —
2 SD Send data →
3 RD Receive data ←
4 RS Request to send —
5 CS Ready to send —
6 DR Data set ready —
7 SG Signal ground —
20 ER Data terminal equipment ready —
The input/output voltage threshold for the logical valued signal is listed below.
Logical Value Input Voltage Threshold Output Voltage Threshold
0 3V min. 5V min.
1 -3V max. -5V max.
25
13
14
1