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4.0 General Operation and Special Features
4.9 Diagnostic Interface Control
The diagnostic software built into the Modem supports a special set of
commands known as diagnostic port commands. The commands (listed
in Table 4-3) are used to configure modems (from either a local or remote
location), or to monitor modems for diagnostic purposes. The diagnostic
port commands are entered from a computer or terminal keyboard.
NOTE
To configure or otherwise control a remote modem, the data rate must be
9600 bps or higher.
4.9.1 D
IAGNOSTIC
P
ORT
The Modem’s diagnostic port is an 8-pin RJ-45 connector allowing you to
test or configure the Modem from a connected computer or other DTE.
The location of the diagnostic connector next to the power connector on
the modem’s rear panel is shown in Figure 2-1. The diagnostic connector
requires a cable with an RJ-45 modular connector on one end (modem) and
a DB25 connector on the other (terminal) end. The pin assignments of this
connector are shown below.
Pin Function
1 Constellation X output
2 Constellation Y output
3 Not used
4 Ground
5 Receive data (output from
modem)
6 Transmit data (input to
modem)
7 Not used
8 Not used
4.9.2 D
IAGNOSTIC
P
ORT
C
OMMANDS
The diagnostic software built into the Modem supports the diagnostic port
commands listed in Table 4-3. These commands are issued from a computer
or other DTE, which must be connected to the modem’s diagnostic port.
To communicate with a modem via the diagnostic port, the DTE must be
configured for 8-bit character length, no parity, 1 stop bit, and a data rate
of 9600 bps.