INFICON Cygnus Thin Film Deposition Controller - Manual (Page 105)

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Cygnus Operating Manual
Chapter 5
Remote Communications
5.1 Remote Communications Overview
This instrument may be remotely controlled, programmed or interrogated. This is
accomplished through remote communications and the use of a remote command
set. The instrument 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. The instrument,
as server, responds to the remote host’s commands.
5.2 Physical Connections
Two types of data communications hardware ports are available. Standard
equipment includes a bit serial RS-232C port. Optionally, an IEEE488 parallel port
may be added. Generally speaking, 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.
Both RS-232C and IEEE488 ports can be used simultaneously.
5.2.1 RS232C Serial Port
RS-232C serial communications are accomplished through an industry standard
9-pin female connector found on the rear panel of the instrument. A mating male
connector is required for attachment of a host interface. The host and instrument
can be separated by up to fifty feet using multiconductor shielded data cable.
The instrument is configured as DCE or Data CommunicationsEquipment.