CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
ODU (Transceiver, BUC, LNB) Operation 10–3 MN-CDM570A
o The PC serial port is connected to the
CDM-570A/570AL rear panel ‘Remote
Control’ port with a user-supplied 9-
pin serial cable.
o The PC Ethernet port is connected to
the CDM-570A rear panel ‘M&C 100’
10/100 or ‘Traffic 100’ BaseT Ethernet
port with a user-supplied hub, switch,
or direct Ethernet cable connection.
o The user PC is running a terminal
emulation program (for operation of
the CDM-570A/570AL Serial Interface)
and a compatible Web browser (for
operation of the CDM-570A HTTP
Interface).
o The CDM-570A/570AL Ethernet Traffic
IP Address has been noted and the
firmware has been identified using
either the CDM-570A/570AL Serial
Interface or the CDM-570A HTTP
Interface ‘Configuration | LAN’ and
‘Admin | Firmware’ pages,
respectively.
10.1.3 CDM-570A/570AL Serial Remote Control – Overview
See Chapter 8. SERIAL-BASED REMOTE PRODUCT MANAGEMENT for an in-
depth explanation of the use of remote commands and queries over the
CDM-570A/570AL Serial Remote Control Interface.
The CDM-570A/570AL Satellite Modem’s serial remote product management interface is an
electrical interface that is either an EIA-485 multi-drop bus (for the control of multiple devices) or
an EIA-232 connection (for the control of a single device). The interface uses ASCII characters in
asynchronous serial form to transmit data between the Controller (e.g., a User PC) and Target
(e.g., the modem and ODU). This data consists of control and status information, transmitted in
packets of variable length in accordance with the structure and protocol explained in detail in
Chapter 8.
The Controller is in charge of the process of monitor and control, and is the only device that is
permitted to initiate, at will, the transmission of data. Targets are only permitted to transmit when
they have been specifically instructed to do so by the Controller.
The exchange of information is transmitted, Controller-to-Target and Target-to-Controller, in
‘packets’. Each packet contains a finite number of bytes consisting of printable ASCII characters,
excluding ASCII code 127 (DELETE).
In this context, the Carriage Return and Line Feed characters are considered printable. With one
exception, all messages from Controller-to-Target require a response – this will be either to return data
that has been requested by the Controller, or to acknowledge reception of an instruction to change the
configuration of the Target.
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