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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
1FGFrame ground —
2SDSend data →
3RDReceive data ←
4RSRequest to send —
5CSReady to send —
6DRData set ready —
7SGSignal ground —
8CDCarrier detect —
20 ER Data terminal equipment ready —
CU-7000
Pin No. Signal Functions
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
Optical Interface
CU-7000
Signal
Name
Pin No.
Host computer,
modem, or
other devices