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8 PROGRAMMING GUIDE
8.1 Introduction
The equipment has built-in management and self-testing functions. The devices can be
connected through the RS232 interface to the terminal or computer with a possibility of the
terminal emulation for controlling and configuring.
Note! The device, primarily configured through the RS232 interface, can be remotely
controlled over the Telnet or HTTP protocols.
Management of devices of Sub-Rack type
The device rear panel contains the TTL management bus, organized according to the
“point/multipoint” scheme. The TTL-RS232 layer translator is on the rear panel of the device. The
socket for the connection to the terminal is on the rear panel as well. If ACU and CMU are
installed in subrack, the management socket is on the front panel.
To connect the terminal, it is necessary to use RS232 cable. While attaching the cable to the
computer COM-port, make sure the port is not occupied by the other device drivers (for example,
mouse).
The terminal must be configured in the following way:
• Transmission rate: 9600 Kbit/s;
• Transmission format: 8-N-1;
• Flow management: XON/XOFF;
• Terminal type: VT100.
At any one time only one device in the card can be logically connected to the management
interface. The device is chosen in accordance with the slot number, in which it is mounted. To
choose the necessary device, type <%SN↵>, where SN is the slot number.
Example: to select the modem, mounted in slot 3, type:
%03↵.
The unit in the card displays %SN after the ECHO command is entered, where SN is the slot
number.
After typing “ECHO”, the operator will receive a response from LTU devices, as it is shown below:
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