Filter
Top Products
129
6. COMMUNICATIONS SETUP AND OPERATION
The T400 is equipped with an Ethernet port, a USB port and two serial communication
ports accessible via two DB-9 connectors on the rear panel of the instrument. The
COM1 connector is a male DB-9 connector and the COM2 is a female DB9 connector.
Both the RS-232 and the COM2 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.
The RS-232 port (used as COM1) can also be configured to operate in single or RS-
232 multidrop mode (option 62; see Sections 3.3.1.8 and 6.3).
The CO
M2 port can be configured for standard RS-232 operation or half-duplex RS-
485 communication (See Sections 3.3.1.8, 6.3, and 6.4). Either of these
configuratio
ns disable use of the USB comm port.
6.1. DATA TERMINAL/COMMUNICATION EQUIPMENT (DTE DCE)
RS-232 was developed for allowing communications between data terminal equipment
(DTE) and data communication equipment (DCE). Basic data 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.
6.2. COMMUNICATION MODES, BAUD RATE AND PORT TESTING
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 configuring the COM2 baud rate
(Section 6.2.2) to match the computer to which the connection is made.
06870C DCN6332