Appendix F – Connecting to a Cisco Router
Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide (S000286G) 38
Step 3: Console Port Final Setup
Send the following command string to the modem connected to the console port of the Cisco router:
AT%R1&W0
The %R1 command sets E0, Q1, &D0, &K0, $SB9600, and %S1, and the &W0 command stores the commands to
memory. The %R1 command sets the following functions:
E0 Turns command echo off
Q1 Turns result codes off
&D0 Ignores DTR from the DTE
&K0 Selects no flow control
$SB9600 Sets the serial baud rate to 9600 bps.
%S1 Disables command mode at all serial speeds except 115200 bps.
The modem is now configured for use on the Cisco router console port. Note that command echo and result codes
have been turned off. If it becomes necessary to send additional AT commands to the modem after it has been so
configured, there will be little feedback from the modem that it has received and acted upon the command. Only
commands such as ATI0 that request specific data from the modem will send any data to the DTE as an indication
that the modem has accepted the command. Temporarily turning on command echo and result codes might ease
reconfiguration of the modem. When the modem is connected to the console port, turn the modem off and then on
again. This will set the serial baud rate to 9600 bps as the $SB9600 command is implemented.
To connect a personal computer to the console port, use the RJ-45-to-RJ-45 roll-over cable and either the RJ-45-to-DB-
25 female DTE adapter or the RJ-45-to-DB-9 female DTE adapter (labeled “TERMINAL”).
Cable Pin-outs and Cabling Guide
Console Modem
(DTE) Console port Console cable Adapter Adapter (DCE)
signal RJ-45 pin RJ-45 pin DB-9 pin DB-25 pin signal
RTS 1 8 8 4 RTS
DTR 2 7 6 20 DTR
XMT 3 6 2 2 XMT
GND 4 5 5 7 GND
GND 5 4 5 7 GND
RCV 6 3 3 3 RCV
DSR 7 2 4 6 DSR
CTS 8 1 7 5 CTS
The configuration of the modem described in Step 3 contains the core settings that allow the modem to function properly
on the console port of the Cisco router. Commands in this section may be done remotely by calling into the MT5634ZBA
attached to the console port with another modem.
Note: Setting country/region configuration and turning on callback security cannot be done remotely. Nor can all
commands be executed remotely if the remote modem is set for callback security; remote configuration of a modem so
configured is not recommended.
Establish a data connection with a remote MT5634ZBA modem.
Send three remote configuration escape characters followed by AT and the setup password, and then press ENTER.
Example: %%%ATMTSMODEM. You have four tries to enter the correct password before being disconnected.
If the password is correct, the remote modem may respond with OK. Note: If the modem has previously been
configured with command echo off and result codes off, it may be difficult to determine if the remote modem is
responding to commands. The ATI command can be used for this purpose. Even with echo and result codes off,
the modem will respond with the requested ID string if it is properly receiving the command.
You can now send AT commands to configure the remote modem.
When you have finished configuring the remote modem, save the new configuration by typing AT&W0<CR>, then
type ATO<CR> to exit remote configuration. You can then break the connection in the normal way.
Note: This step is important to ensure that the connection is broken cleanly.