Alpha Technologies Cordex Controller Ver.2.0 - Manual (Page 94)

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8.3.3 Null Modem Direct Cable Connection Support
The CXC supports the use of a direct DB-9 null modem cable connection to a computer running Windows
 2000.
The null modem cable is connected to either the front panel RS-232 serial craft port interface or rear RS-232
serial port interface (requires the CXC to be supplied with the List Option 95 Communications Board assembly).
A null modem cable connection to the front port typically requires just a simple three-wire null modem cable (TxD,
RxD and GND) for terminal emulation access (Alpha diagnostics usage). However, for a fully functional
Windows
 PPP web connection for the TCP/IP, the Windows serial driver on the computer connecting to the
CXC requires a standard null modem cable. See Figure 101 that follows:
Figure 101–RS-232 null modem cable pinouts
8.3.4 Configuring Rear Modem Port Settings (CXCP or CXCR only)
The “Rear Port Device” section of the Modem menu (or the corresponding section of the “Configure
Communications Parameters” page of the web interface) enables the user to configure which type of serial device
is enabled for the rear port, see 6.8.4.
8.3.4.1 Internal Modem
Use this list box selection if the system includes List Option 101.
8.3.4.2 External Modem
Use this list box selection if there is an external modem connected with a straight through DB-9
cable to the DB-9 port on the communications daughterboard (requires List Option 95).
8.3.4.3 NULL Modem
Use this list box selection if there is a standard crossover null modem cable connecting a
computer running Windows
 2000 to the DB-9 port on the communications daughterboard
(requires List Option 95).