Microsoft LPF-00004 Manuel de l'opérateur Page 147

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SERIAL COMMUNICATION CABLES Page 129
C
YBER
A
MP
380, COPYRIGHT MARCH 2002, AXON INSTRUMENTS, INC.
SERIAL COMMUNICATIONS CABLES
Most serial communications problems stem from an incorrectly wired cable furnished (at low cost) by
some vendors. If using a PC compatible with either a 9-pin or a 25-pin D connector, we recommend
purchase of an RS232-01 cable from Axon Instruments or a "null-modem" cable from a good vendor.
This is the type of serial cable used to connect a computer to a pen plotter. It is not the type of cable
normally used to connect a modem.
With a Macintosh II, most serial printer cables should work well with the CyberAmp. The RS232-03
cable from Axon Instruments is suitable for connecting the CyberAmp to a Macintosh II.
To daisy chain multiple CyberAmps or compatible instruments onto one RS-232 port, a simple 25-pin
flat cable should be used. The RS232-02 cable from Axon Instruments is suitable.
If problems arise first check the cable connections with a meter to make sure that they correspond to
the connections shown in the table below.
To construct a cable to connect a computer to the CyberAmp, the minimum set of connections are as
follows.
For an IBM PC-AT with a 9-pin connector
IBM 9-pin 25-pin CyberAmp RS-232 IN
Pin number connected to Pin number
2 (RXD) 2 (TXD)
3 (TXD) 3 (RXD)
5 (GND) 7 (GND)
6 and 8 (CTS, DSR) 20 (DTR)
For an IBM PC or PC/XT with a 25-pin connector
IBM 25-pin 25-pin CyberAmp RS-232 IN
Pin number connected to Pin number
1 (Shield) 1 (shield)
2 (TXD) 3 (RXD)
3 (RXD) 2 (TXD)
7 (GND) 7 (GND)
5, 6 (CTS, DSR) 20 (DTR)
For a Macintosh II with an 8-pin connector
Mac II 8-pin 25-pin CyberAmp RS-232 IN
Pin number connected to Pin number
2 (DCD) 20 (DTR)
3 (TD) 3 (RXD)
4 (GND) 7 (GND)
5 (RD) 2 (TXD)
8 (Link to GND) 1 (Shield)
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