AMT-70/AMT-73/AMT-75 Installation and Operation
CHAPTER 5 MANAGING THE MODEM
It is recommended that Chapter 3 be reviewed to understand the operational features of this modem
prior to setting up the modem.
5.1 Using the RS-232 Port
A User ID and Password is required for gaining access to the modem. From the factory, the User ID
and Password is set to:
Note:
Initial access to the modem is via a RS-232 asynchronous serial port that is available for the external
monitor and control of the modem functions. The input is a 9-pin female D connector (P7 for the AMT-
70 and J11 for the AMT-73L), on the rear panel.
To use the rear panel serial connector, attach an ASCII terminal to the D connector as labeled above.
The input data is applied to pin 3, and the output data is available at pin 2. A standard one-to-one
cable from the 9-pin COM port of a PC will provide the proper connection.
When you use HyperTerminal (Windows) or Minicom (Linux), the port configuration setup must be
as follows: 57600/N/8/1.
Since the RS-232 port is not addressable, it can be used
Userid = root
Password = adminop
It is recommended that the password be changed upon delivery to protect the settings of the modem.
Follow the steps starting on Paragraph 5.4 for gaining access and controlling the modem, along with
setting up the RS-485 port address, speed, parity, number of data bits, and stop bits. Further in this
Chapter are also instructions for setting up the IP address and subnet mask of the two Ethernet ports.
5.2 Using RS-485 Rear Panel Remote M&C
A dual function RS-485 (P8 for the AMT-70 and J13 for the AMT-73) port is also present at the rear
panel. This port is set to 4-wire operation. For monitor and control over this port the mcadd command
must be used in order to define the tributary address of the modem. The RS-485 port can be
controlled by different protocols; ASCII, binary packet mode or BUC control.
Using the RS-485 port with the command or packet protocol allows a number of modems to be
controlled from a client PC. Each modem being controlled on the same bus must have a unique
address set. Refer to Error! Reference source not found. of this document for further information and
instructions for setting the RS-485 addresses and modes. Refer to Paragraph 8.10 for pin-outs.
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Some PCs do not respond well to the +5 VDC applied to pin 9
(refer to Paragraph 8.7 for pin-outs).
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