Serial Cables
Null Modem
Acorn RISC OS Computer->Modem
Acorn RISC OS Computer->BBC Microcomputer
PC Computer->Modem
Null modem leads
Null modem leads (25-to-25)
Signal Pin no. Pinno. Signal
FG 1 1 FG
TxD 2 3 RxD
RxD 3 2 TxD
RTS 4 5 CTS
CTS 5 4 RTS
DSR 6 20 DTR
SG 7 7 SG
DCD 8 20 DTR
DTR 20 6, 8 DSR, DCD
Signal Pin no. Pin no. Signal
FG 1 1 FG
TxD 2 3 RxD
RxD 3 2 TxD
RTS 4 8 DCD
CTS 5 8 DCD
DSR 6 20 DTR
SG 7 7 SG
DCD 8 4, 5 RTS, CTS
DTR 20 6 DSR
Acorn RISC OS Computer->Modem Cable
Acorn RISC OS Computer->Modem Cable (9-to-25)
Signal Pin no. Pin no. Signal
FG 1 (unconnected)
TxD 2 3 RxD
RxD 3 2 TxD
RTS 4 20 DTR
CTS 5 7 SG
DSR 6 5 CTS
SG 7 4 RTS
DCD 8 (unconnected)
DTR 9 8 DCD
Plus: Connect pins 1,4 and 8 together at the Acorn end of the cable
Acorn RISC OS Computer->BBC Microcomputer
Acorn RISC OS Computer->BBC Microcomputer(9-to-5)
Signal Pin no. Pin no. Signal
FG 1
TxD 2 3 RxD
RxD 3 4 RTS
RTS 4
CTS 5 1 FG
DSR 6
SG 7 2 TxD
DCD 8 5 CTS
DTR 9
Plus: Connect pins 1,4 and 6 together at the Acorn end of the cable
PC Computer->Modem Cable
PC Computer->Modem Cable (9-to-25)
Signal Pin no. Pin no. Signal
FG 1 8 DCD
TxD 2 3 RxD
RxD 3 2 TxD
RTS 4 20 DTR
CTS 5 7 SG
DSR 6 6 DSR
SG 7 4 RTS
DCD 8 5 CTS
DTR 9 22 RI
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