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SuperDrive 6.10 | 30
connected to pin 2 of the connector DB9 and so forth.
Table below shows the pin location of this cable.
Modem
PC
Signal name
DB25
DB9
DB9
DB25
Signal name
CD (Carrier Detect)
8
1
1
8
CD
RD (Receive Data)
3
2
2
3
RD
TD (Transmit Data)
2
3
3
2
TD
DTR (Data Terminal Ready)
20
4
4
20
DTR
SG (Signal Ground)
7
5
5
7
SG
DSR (Data Set Ready)
6
6
6
6
DSR
RTS (Request To Send)
4
7
7
4
RTS
CTS (Clear To Send)
5
8
8
5
CTS
RI (Ring Indicator)
22
9
9
22
RI
FG (Frame Ground)
1
-
-
1
FG
Drive/PC RS232 serial cable (SuperDrive Standard Cable)
Drive/PC RS232 serial Cable is the standard cable.
Null Modem Cable (Crossover Cable)
The cable used to connect the modem to the SuperDrive standard cable is named as null modem or
crossover cable.
The Null Modem cable allows two DTE RS232 devices to communicate with each other. In order to do that,
the TD signal from one device shall be connected to the RD input of the other device (and vice versa).
The following table indicates the pins connection when using a null modem cable.
Connector Side A
Connector Side B
Signal name
DB25
DB9
DB9
DB25
Signal name
FG (Frame Ground)
1
-
-
1
FG
TD (Transmit Data)
2
3
2
3
RD
RD (Receive Data)
3
2
3
2
TD
RTS (Request To Send)
4
7
8
5
CTS
CTS (Clear To Send)
5
8
7
4
RTS
SG (Signal Ground)
7
5
5
7
SG
DSR (Data Set Ready)
6
6
4
20
DTR
CD (Carrier Detect)
8
1
4
20
DTR
DTR (Data Terminal Ready)
20
4
1
8
CD
DTR (Data Terminal Ready)
20
4
6
6
DSR
For this application only signals RD, TD and GND are used..
RS232 SuperDrive Modem Serial Cable (Unique Cable)
It is also possible to use an only cable to connect the modem to the drive. This cable replaces the modem
null cable + SuperDrive standard cable.
In general the RS232 serial port of the modem is DB9 female or DB25 female.
Figure below shows the cable parts for point-to-point RS232 connection. Only pins 2, 3 and 5 of the DB9
female connector are used.