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230
8-12. Modem Communication
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System configuration: One computer and one FP-M control board
The following diagrams show the pin layout of the cables for modem communication.
Cable pin layout
Cable 1:
Cable 2: Between a modem and RS232C port of FP-M control board
Modem (25 pins)
Pin No.
1
2
3
4
5
7
8
9
6
Abbreviation
FG
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
SG
ER (DTR)
RS232C port (25 pins)
of FP-M control board
Pin No.
1
2
3
4
5
7
8
20
22
Abbreviation
FG
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
SG
CD (DCD)
ER (DTR)
RI (CI)
IBM PC-AT (9 pins)
Pin No.
1
2
3
4
5
6
7
8
9
Abbreviation
CD (DCD)
RD (RXD)
SD (TXD)
ER (DTR)
SG
DR (DSR)
RS (RTS)
CS (CTS)
RI (CI)
Modem (25 pins)
Pin No.
1
2
3
4
5
6
7
8
20
Abbreviation
FG
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG
CD (DCD)
ER (DTR)
Personal computer (25 pins)
Pin No.
8
3
2
20
7
6
4
5
22
Abbreviation
CD (DCD)
RD (RXD)
SD (TXD)
ER (DTR)
SG
DR (DSR)
RS (RTS)
CS (CTS)
RI (CI)
Pin No.
1
2
3
4
5
6
7
8
20
Abbreviation
FG
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG
CD (DCD)
ER (DTR)
Modem (25 pins)
• Between IBM PC-AT (9 pins) and a modem (25 pins)
• Between a personal computer (25 pins) and a modem
(25 pins)
FP-M control board
Computer
Cable 1
Telephone line
Modem
Modem
Cable 2
Содержание FP-M Hardware
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