serial interface cable
8 pin RJ45 (8P8C) male
connector
9 pin D-SUB female
connector
DB-25 to DB-25, straight-thru
DB-25 DB-25
M / F M / F
-------- --------
2 TxD ------------ TxD 2
3 RxD ------------ RxD 3
7 Gnd ------------ Gnd 7
20 DTR ------------ DTR 20
6 DSR ------------ DSR 6
8 DCD ------------ DCD 8
4 RTS ------------ RTS 4
5 CTS ------------ CTS 5
DB-25 to DB-25, crossover
DB-25 DB-25
M / F M / F
-------- --------
2 TxD ------------ RxD 3
3 RxD ------------ TxD 2
7 Gnd ------------ Gnd 7
20 DTR --------|--- DSR 6
|--- DCD 8
6 DSR ---|-------- DTR 20
8 DCD ---|
4 RTS ------------ CTS 5
5 CTS ------------ RTS 4
DB-25 to DB-9, straight-thru
DB-25 DB-9
M / F M / F
-------- --------
2 TxD ------------ TxD 3
3 RxD ------------ RxD 2
7 Gnd ------------ Gnd 5
20 DTR ------------ DTR 4
6 DSR ------------ DSR 6
8 DCD ------------ DCD 1
4 RTS ------------ RTS 7
5 CTS ------------ CTS 8
DB-25 to DB-9, crossover
DB-25 DB-9
M / F M / F
-------- --------
2 TxD ------------ RxD 2
3 RxD ------------ TxD 3
7 Gnd ------------ Gnd 5
20 DTR --------|--- DCD 1
|--- DSR 6
6 DSR ---|-------- DTR 4
8 DCD ---|
4 RTS ------------ CTS 8
5 CTS ------------ RTS 7
RJ-45 (Cyclades) to DB-25, straight-thru
RJ-45 DB-25
Cyclades M / F
-------- --------
3 TxD ------------ TxD 2
6 RxD ------------ RxD 3
4 Gnd ------------ Gnd 7
2 DTR ------------ DTR 20
8 DSR ------------ DSR 6
7 DCD ------------ DCD 8
1 RTS ------------ RTS 4
5 CTS ------------ CTS 5
RJ-45 (Cyclades) to DB-25, crossover
RJ-45 DB-25
Cyclades M / F
-------- --------
3 TxD ------------ RxD 3
6 RxD ------------ TxD 2
4 Gnd ------------ Gnd 7
2 DTR --------|--- DSR 6
|--- DCD 8
7 DCD ---|-------- DTR 20
8 DSR ---|
1 RTS ------------ CTS 5
5 CTS ------------ RTS 4
RJ-45 (Cyclades) to DB-9, straight-thru
RJ-45 DB-9
Cyclades M / F
-------- --------
3 TxD ------------ TxD 3
6 RxD ------------ RxD 2
4 Gnd ------------ Gnd 5
2 DTR ------------ DTR 4
8 DSR ------------ DSR 6
7 DCD ------------ DCD 1
1 RTS ------------ RTS 7
5 CTS ------------ CTS 8
RJ-45 (Cyclades) to DB-9, crossover
RJ-45 DB-9
Cyclades M / F
-------- --------
3 TxD ------------ RxD 2
6 RxD ------------ TxD 3
4 Gnd ------------ Gnd 5
2 DTR --------|--- DCD 1
|--- DSR 6
7 DCD ---|-------- DTR 4
8 DSR ---|
1 RTS ------------ CTS 8
5 CTS ------------ RTS 7
RJ-45 (Cyclades) to RJ-45 (Cyclades), straight-thru
RJ-45 RJ-45
Cyclades Cyclades
-------- --------
3 TxD ------------ TxD 3
6 RxD ------------ RxD 6
4 Gnd ------------ Gnd 4
2 DTR ------------ DTR 2
8 DSR ------------ DSR 8
7 DCD ------------ DCD 7
1 RTS ------------ RTS 1
5 CTS ------------ CTS 5
RJ-45 (Cyclades) to RJ-45 (Cyclades), crossover
RJ-45 RJ-45
Cyclades Cyclades
-------- --------
3 TxD ------------ RxD 6
6 RxD ------------ TxD 3
4 Gnd ------------ Gnd 4
2 DTR --------|--- DCD 7
|--- DSR 8
7 DCD ---|-------- DTR 2
8 DSR ---|
1 RTS ------------ CTS 5
5 CTS ------------ RTS 1
RJ-45 (Cyclades) to RJ-45 (Sun/Cisco), straight-thru
RJ-45 RJ-45
Cyclades Sun/Cisco
-------- ---------
3 TxD ------------ TxD 3
6 RxD ------------ RxD 6
4 Gnd --------|--- Gnd 4
|--- Gnd 5
2 DTR ------------ DTR 2
7 DCD ------------ DSR 7
1 RTS ------------ RTS 1
5 CTS ------------ CTS 8
RJ-45 (Cyclades) to RJ-45 (Sun/Cisco), crossover
RJ-45 RJ-45
Cyclades Sun/Cisco
-------- ---------
3 TxD ------------ RxD 6
6 RxD ------------ TxD 3
4 Gnd --------|--- Gnd 4
|--- Gnd 5
2 DTR ------------ DSR 7
7 DCD ------------ DTR 2
1 RTS ------------ CTS 8
5 CTS ------------ RTS 1
RJ-45 (Cyclades) to MMJ (DEC), crossover
RJ-45 MMJ
Cyclades DEC
-------- ---------
3 TxD ------------ RxD 5
6 RxD ------------ TxD 2
4 Gnd --------|--- Gnd 3
|--- Gnd 4
2 DTR ------------ DSR 6
7 DCD ------------ DTR 1
DB-9 to DB-9, crossover
DB-9 DB-9
M / F M / F
-------- --------
1 ----+--------- 4 (1 and 6 to 4)
6 ----+
2 -------------- 3 (2 connected to 3)
3 -------------- 2 (3 connected to 2)
4 --------+----- 1 (4 connected to 1 and 6)
+----- 6
5 -------------- 5 (5 connected to 5)
7 -------------- 8 (7 connected to 8)
8 -------------- 7 (8 connected to 7)