132
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