Teledyne T703, T703U 5. COMMUNICATIONS

Teledyne API T703/T703U Calibrator Operation Manual Communications
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5. COMMUNICATIONS
5.1. USING THE ANALYSER’S COMMUNICATION PORTS
The T703 is equipped with two serial communication ports, labeled RS232 (male DB-9
connector) and COM2 (female DB-9 connector), a USB com port and an Ethernet port
located on the rear panel.
The RS232 (COM1) and COM2 ports operate similarly and give the user the ability to
communicate with, issue commands to, and receive data from the calibrator through an
external computer system or terminal.
 The RS-232 port (COM1) can also be configured to operate in standard or RS-232
multidrop mode (Section 5.3).
 The COM2 port is configured for standard RS-232 operation by default, but can be
configured for half-duplex RS-485 communication. (Contact the factory for RS-485
communication configuration).
 The COM2 port is disabled for all but Multidrop communications when the unit is
configured for USB communications.
The Ethernet connector allows the instrument to be connected to a network running
TCP/IP or to the public Internet if access is available. The network must have routers
capable of operating at 10Base-T or 100Base-T. DHCP is enabled by default (Section
5.6.1). This configuration is useful for quickly getting an instrument up and running on a
network. However, for permanent Ethernet connections, a static IP address should be
used (Section 5.6.1.1).
5.1.1. RS-232 DTE AND DCE COMMUNICATION
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 & 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. Edit the Instrument and Gateway IP addresses and Subnet Mask to the desired
settings. Then, from the computer, enter the same information through an application
such as HyperTerminal.
07223C DCN6572