INFICON SQM-160 Thin Film Deposition Monitor - Manual (Page 61)

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SQM-160 Operating Manual
Chapter 5
Communications
5.1 Introduction
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 or a USB 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.
5.1.1 RS-232C Serial Port
RS-232C serial communications are accomplished through an industry standard
9-pin female connector found on the rear panel of the SQM-160. A mating male
connector is required for attachment of a host interface. The host and the SQM-160
can be separated by up to fifty feet using multiconductor shielded data cable. For
successful communciations the baud rate of the host and SQM-160 must match.
Avaiable baud rate options are: 2,400, 4,800, 9,600, 19,200, 38,400, 57,600,
115,200 Baud.
The SQM-160 is configured as DCE (Data Communication Equipment).
NOTE: Unpredictable RS-232 hardware/software combinations may occasionally
cause a command to not be recognized by the SQM-160. Consequently,
all communications should include an automatic retry procedure. If a
command sent via RS-232 does not produce a response from the
SQM-160 within three seconds, it should be sent again.
5.1.2 USB Port
For USB communications, when the SQM-160 is connected to a USB port, it will
be found and installed automatically by Windows. If it is not, a manual installation
can be done from the 074-5000-G1 INFICON CD-ROM using the
"SQM-160USBinstaller.exe." If an unsigned driver window pops up during
installation, click "continue anyway." You can confirm successful communication
using the SQM-160 Comm software.