6 rs-232c interface specifications, 1 ] interface connector and pin assignment – Denso BHT-7500 User Manual
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5.6 RS-232C Interface Specifications
[ 1 ] Interface Connector and Pin Assignment
The CU-7000 has an RS-232C interface port (Dsub-25S).
RS-232C interface port (Dsub-25S) on the CU-7000
Pin No.
Signal
Functions
Signal Input/Output
CU-7000 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
—
8
CD
Carrier detect
—
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
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