ComStream CM601, Installation And Operation Manual

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2-4 Theory of Operation
The CM601 M&C card is the focal point for all user interface command and
control activities. This card serves as a command gateway between you, the
operator, and any other CM601 cards. It supports status relay output as well as
status relay sense signal inputs. The remote control port and front panel user
interfaces are supported by the M&C microcontroller.
Option Cards
The CM601 can accommodate one user-specified option card in addition to the
two required cards. The most common option cards are:
Satellite Control Channel
ComStream Reed-Solomon
Satellite Control Channel/ComStream Reed-Solomon combination card
For additional information on and availability of these option cards, call
ComStream Customer Service.
If an option card or different data interface card is required, it is installed in slot 1.
If this slot is not used, it must be covered by a blank filler plate to suppress
emissions and ensure safety-regulation compliance.
It is possible for two of the same type of option cards to operate in the CM601 at
the same time. This common application is required when the interface on the
transmit side is different than that on the receive side. For example, the required
transmit data rate may be 512 kbps with an RS-449 electrical interface. However,
the required receive data rate may be 9.6 kbps with an RS-232 electrical interface.
The CM601 easily supports this application requirement by allowing both an
RS-449 modem card and an RS-232 data I/O card to be installed. You, the
operator, then designate the transmit and receive I/O parameters by issuing
commands through either the front panel or remote terminal
Additional CM601 option cards can be ordered to simplify sparing or to allow
configuration changes without returning a CM601 to the factory. All CM601
option cards described in this guide can be ordered individually.
System Monitor and Control
The CM601 modem and its cards can be configured, monitored, and controlled
from either the front panel or remote terminal.
Local CM601 control is provided through the front panel push buttons, LCD
display, and LED indicators.
Remote CM601 control is provided through the remote terminal, which is
connected to the CM601 at the M&C remote control port. The remote terminal is
used to issue commands and monitor status typically using ASCII protocol and
RS-232 electrical levels. This remote interface can also be configured for RS-485
electrical levels and packet-based protocol when required.