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USR4204 User Guide

Page 15 of 69

Local Echo - Disabled

If available, disable Local Echo to prevent USR4204 transmissions from recirculating

between the modem and the USR4204.

Auto-Answer - Enabled

Auto-Answer does not apply to cellular modems, however the recommended setup for

cellular out-of-band remote management does require the modem to connect whenever

contact is initiated by the management terminal.

Carrier Detect Signal - Active

If available, the RS-232 Carrier Detect signal should be active (not overridden) so the

USR4204 will automatically present its Main Menu upon connection and automatically close

ports upon disconnection.

Error Correction - Enabled

Error Correction does not apply to cellular modems. The TCP/IP protocol handles flow

control messages transparently.

Xon/Xoff Flow Control- Enabled

Enable Xon/Xoff flow control in the modem if the USR4204 has flow control enabled.

Enable Xon/Xoff flow control in the USR4204 and in the modem to prevent

buffer overflow for any of these situations:

 The equipment being managed through the USR4204 uses serial

rates different from 9600bps

 USR4204 batch configuration files are larger than 1500 characters

 USR4204 linefeed pacing is enabled

AT Commands - Disabled (a.k.a. “Dumb Mode”)

The Dumb Mode requirement does not apply to cellular modems because a key-press

cannot abort a cellular connection.

Cabling the Cellular Modem

Once the cellular modem has been properly configured, it may be attached to the USR4204

terminal port.

Modem Connector

Adaptors and Cables Needed

DB25F

Provided DB25 Adapter and provided RJ45 rollover cable.

DB9F

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.

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