Teledyne 9110T Data Terminal / Communication Equipment DTE DEC, Communication Modes, MODE1

Model 9110TH NOx Analyzer Communications Setup and Operation

6. COMMUNICATIONS SETUP AND OPERATION

This instrument’s rear panel connections include an Ethernet port, a USB port (option) and two serial communications ports labeled RS232, which is the COM1 port, and COM2 (refer to Figure 3-4). These ports 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.

6.1. DATA TERMINAL / COMMUNICATION EQUIPMENT (DTE DEC)

RS-232 was developed for allowing communications between data terminal equipment (DTE) and data communication equipment (DCE). Basic terminals always fall into the DTE category whereas modems are always considered DCE devices. The difference between the two 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.

To allow the analyzer to be used with terminals (DTE), modems (DCE) and computers (which can be either), a switch mounted below the serial ports on the rear panel labeled DCE DTE (Figure 3-4) allows the user to set the RS-232 configuration for one of these two data devices. This switch exchanges the Receive and Transmit lines on RS-232 emulating a cross-over or null-modem cable. The switch has no effect on COM2.

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).

6.2.1. COMMUNICATION MODES

Each of the analyzer’s serial ports can be configured to operate in a number of different modes, listed in Table 6-1. As modes are selected, the analyzer sums the mode ID numbers and displays this combined number on the front panel display. For example, if quiet mode (01), computer mode (02) and Multi- Drop-Enabled mode (32) are selected, the analyzer would display a combined MODE ID of 35.

MODE1	ID
QUIET	1

Table 6-1: COMM Port Communication Modes

DESCRIPTION

Quiet mode suppresses any feedback from the analyzer (such as warning messages) to the remote device and is typically used when the port is communicating with a computer program where such intermittent messages might cause communication

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