Remote Access; Setting Up - US Robotics USR4204 User Manual

Remote Access

Setting Up

Confirm requirements:
Computer terminal with a COM port
Terminal emulation application
Modem at the management site
Modem at the equipment site
Access to phone line (analog connection only) or Cellular service (cellular connection
only) at both locations
To remotely connect to the USR4204, the modem must be configured before connecting it
to the USR4204 at the equipment site.
Configuring the Modem
The modem connected to the USR4204 must be pre-configured for result codes disabled,
local echo disabled, auto-answer enabled, AT commands disabled ("Dumb mode"), and a
fixed DTE rate of 9600bps, 8N1. To set the modem DTE rate, use a terminal set at 9600bps,
8N1 to send commands to the modem to establish the modem DTE rate. Disable result
codes, disable local echo, enable auto-answer, and then store the updated settings into
modem memory. Then disable AT commands, which is normally done by flipping a physical
switch on the modem. Consult the modem's user guide for details.
The modem should not override the Carrier Detect signal and Error Correction
should be enabled, which are typically default modem settings.
If the equipment being managed through the USR4204 uses serial rates
different from 9600bps, XON/XOFF flow control may need to be enabled in
the USR4204 and in the modem to prevent buffer overflow.
Connecting the Modem
Once the modem has been properly configured, it may be attached to the USR4204 terminal
port and telephone line.
Modem Connector
DB25F
DB9F
USR4204 User Guide
Adaptors and Cables Needed
Provided DB25 Adapter and provided RJ45 rollover cable.
Select one of the following:
Purchase a RJ45-to-DB9M null modem adaptor and use
the provided RJ45 rollover cable.
Purchase a RJ45-to-DB9M adaptor and use a straight
Ethernet cable.
Purchase a DB25F-to-DB9M adaptor and use the
provided RJ45-to-DB25M adaptor and RJ45 rollover
cable.
See appendix A for the wiring diagrams for all options.
Page 13 of 52