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Cygnus 2 Operating Manual
Chapter 9
Remote Communications
9.1 Remote Communication Configuration Overview
Cygnus 2 may be remotely controlled, programmed or interrogated. This is
accomplished through remote communications and the use of a remote command
set. Cygnus 2 will respond to messages that contain these commands. It will accept
and operate on messages one at a time. It will respond to each command by
carrying out valid operations and/or returning a message to the sender. A
host/server relationship is established in remote communications. Cygnus 2, as
server, responds to the remote host’s commands.
9.2 Physical Connections
You may choose to use one of two types of data communications hardware ports.
Standard equipment includes a bit serial RS-232C port.
Optionally, a TCP/IP port may be added.
Both RS-232C and TCP/IP ports can be used simultaneously.
Both the host and server must have the same form of communications equipment
and complementary set up. For serial communications, baud rates must match and
so must the data word format.
The word format for bit serial lines (RS-232C) is comprised of ten signal bits: eight
data bits, one start bit, one stop bit and no parity. The eight data bits comprise a
byte of information or character whose ASCII value ranges from 0 to 255.
9.2.1 RS-232C Serial Port
RS-232C serial communications are accomplished through an industry standard
9-pin female connector found on the rear panel of Cygnus 2. A mating male
connector is required for attachment of a host interface. The host and Cygnus 2 can
be separated by up to fifty feet using multiconductor shielded data cable.
Cygnus 2 is configured as DCE (Data Communication Equipment).
NOTE: Unpredictable RS-232 hardware/software combinations may occasionally
cause a command to not be recognized by Cygnus 2. Consequently, all
communications should include an automatic retry procedure. If a
command sent via RS-232 does not produce a response from the
Cygnus 2 within three seconds, the command should be sent again.
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