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6.
COMMUNICATIONS SETUP AND OPERATION
DATA TERMINAL/COMMUNICATION EQUIPMENT
6.1.
6.2. COMMUNICATION MODES, BAUD RATE AND PORT
TESTING
07275B DCN6418
This instrument's rear panel connections include an Ethernet port, a USB port
(option) and two serial communication (COM) ports labeled RS232, which is the
COM1 port, and COM2 (see Figure 3-2). Both COM ports operate similarly and
give the user the ability to communicate with, issue commands to, and receive
data from the analyzer through an external computer system or terminal.
Connection instructions were provided in Section 3.3.1.8.
This section provides pertinent information regarding communication equipment,
describes the instrument's communications modes, presents configuration
instructions for the communications ports, and provides instructions for their use,
including communications protocol. Data acquisition is presented in Section 7.
By default, both COM ports operate on the RS-232 protocol.
RS-232 was developed for allowing communications between data terminal
equipment (DTE) and data communication equipment (DCE).
terminals always fall into the DTE category whereas modems are always
considered DCE devices.
Electronically, the difference between the DCE and DTE is the pin assignment of
the Data Receive and Data Transmit functions.
DTE devices receive data on Pin 2 and transmit data on Pin 3.
DCE devices receive data on Pin 3 and transmit data on Pin 2.
A switch located below the serial ports on the rear panel allows the user to switch
between DTE (for use with data terminals) or DCE (for use with modems). Since
computers can be either DTE or DCE, check your computer to determine which
mode to use.
Use the SETUP>MORE>COMM menu to configure COM1 (labeled RS232 on
instrument rear panel) and/or COM2 (labeled COM2 on instrument rear panel)
for communication modes, baud rate and/or port testing for correct connection. If
using a USB option communication connection, setup requires USB driver
download and configuring a few settings for (Section 6.4).
(DTE DCE)
Basic data
113
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