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Signal Input/Output
External
device
[ 3 ] Interface Specifications
RS-232C Interface Port (Dsub-25S) on the CU-7000
25
13
14
1
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 —
CU-7000
Pin No. Signal Functions
NOTE
Shown below is a diagram of the internal connection in the CU-7000.
2
7
8
20
6
5
4
3
1
SD
SG
CD
ER
DR
CS
RS
RD
FG
Not used.
RS-232C
Interface
Circuitry
Optical
Communications
Interface
Circuitry
BHT-7000
Optical Interface
CU-7000
Signal
Name
Pin No.
Host computer,
modem, or
other devices