Serial Interfaces; Serial I/O Default Settings - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual

6.8. Serial Interfaces

The M300E has two serial interface ports COM-A and COM-B. Both ports operate
identically and give the user the ability to communicate with, issue commands to,
and receive data from the analyzer via an external computer system or terminal.
The default configuration for either port is 19,200 bits/second, adjustable down to
300 bits per second or up to 115200 bits per second. COM-A is always configured
as an RS-232 port. COM-B can be configured to be an RS-232, RS-485 half-duplex,
or 10BaseT Ethernet connection; by default COM-B is configured for RS-485
operation. An optional interface assembly is required for Ethernet operation.
Multidrop Communications
There are two options for users who wish to connect multiple analyzers with a
single computer terminal or datalogging device over a single serial communications
line (i.e. daisy chain). Either port can be equipped with an optional RS-232
multidrop assembly (contact T-API sales for price and availability), or alternatively
up to 8 analyzers can be multidropped together with no adapters by connecting
using COM-B configured for RS-485 operation (contact the factory for further
information).
Ethernet Communications
When equipped with the optional Ethernet interface assembly (contact T-API sales
for price and availability), the analyzer can be connected to any standard 10BaseT
Ethernet network. The interface operates as a standard port 3000 TCP-IP device.
This allows COM-B to be connected via the Internet to a remote computer using
either APIcom or a serial port redirector.

6.8.1. Serial I/O Default Settings

As received from the factory, the analyzer is set up to emulate a DCE or modem,
with Pin 3 designated for receiving data and Pin 2 designated for sending data.
DEFAULT BAUD RATE: 19,200 bits per second
DATA BITS: 8 with one Stop bit, no Start bit
PARITY: None
The RS-232, db-9 connector on the analyzer's Rear panel is configured as follows:
P/N 04288 REV: A
Cables that appear to be compatible because of matching connectors may
incorporate internal wiring that make the link inoperable. Check unknown
cables pin-for-pin before using.
Operating Instructions
CAUTION
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