Appendix D

RS-232 Cabling

Introduction

This appendix details the RS-232 cabling between the instrument and a PC, instrument controller (Fluke 17XXA series), printer, or modem. All connections can be made using the Fluke RS-series of cables (see Options and Accessories in Chapter 1). RS-232 cables should not exceed 50 feet (15 meters) although longer cables are permitted if the load capacitance measured at a connection point (including signal terminator) does not exceed 2500 picofarads. The Fluke RS cables are 6 feet (1.83 meters) in length.

Connections

Figure D-1 summarizes the cable requirements for all typical RS-232 connections; Figure D-2 through E-6 summarize instrument cabling diagrams; Figure D-7 shows the pin arrangement for DB-9 and DB-25 connectors. There are two wiring schemes (modem and null-modem), two types of connectors (DB-9 and DB-25), two cable end conditions (male and female), and two equipment configurations (Data Terminal Equipment [DTE] and Data Communications Equipment [DCE]). Because of variations in RS-232 connectors, it is not possible to identify all possible configurations. In this application, “null-modem” refers to a reversing of the following lines; receive (RX) and transmit (TX), data terminal ready (DTR) and data set ready (DSR), and request to send (RTS) and clear to send (CTS). Not all interfaces use all lines. Check the documentation for the equipment you are interfacing with the instrument.

Cables

The Fluke RS-series of RS-232 cables are in the following standard configurations:

RS40 - Null modem with DB-9/female and DB-25/female connectors

RS41 - Modem with DB-9/female and DB-25/male connectors

RS42 - Null modem with DB-9/female and DB-25/male connectors

Cables from other sources may be used, or cables can be fabricated based on the figures in this appendix. The RS40 and RS42 cables are identical, except for the DB-25 connectors (female and male, respectively). Some interfaces allow a selection of cables.

D-1

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Fluke 2635A user manual RS-232 Cabling, Cables

2635A specifications

The Fluke 2635A is a highly advanced multichannel data acquisition system designed for engineers and technicians requiring precision and versatility in their measurement tasks. This instrument excels in monitoring and capturing data from various sources, making it a valuable tool in laboratories, production environments, and field applications.

One of the standout features of the Fluke 2635A is its ability to support up to 20 measurement channels. Users can simultaneously monitor multiple signals, which is crucial for complex testing scenarios where numerous variables need to be tracked. The device is equipped with a 6.5-digit precision measurement capability that ensures high accuracy and resolution in readings. This level of precision is particularly beneficial in applications such as environmental monitoring, research and development, and industrial process control.

The unit incorporates a variety of measurement modes, including voltage, current, temperature, and resistance, making it exceptionally versatile. The Fluke 2635A not only handles standard signals but also integrates with various transducers, providing extensive compatibility for users engaged in diverse testing applications.

To enhance data management, the Fluke 2635A offers advanced data logging capabilities. Data can be stored internally or transferred to external devices for further analysis. The internal memory can accommodate extensive datasets, which can be crucial in long-term monitoring tasks. Integration with external software enables users to analyze and visualize data effectively, allowing for informed decision-making based on comprehensive results.

The user interface is designed for ease of use, featuring a large, bright LCD display that clearly presents measurements and status information. The device is also equipped with a simple navigation system, allowing users to switch between channels and measurement types without hassle.

In terms of construction, the Fluke 2635A is built to withstand rigorous environments. It features a robust design that ensures reliability and durability, making it suitable for both laboratory settings and field operations. Furthermore, the device supports a wide temperature range, thus enabling usage in diverse conditions.

Overall, the Fluke 2635A is a powerful and flexible instrument that provides precise measurements across multiple channels, supporting a wide range of applications. Its advanced technology, combined with user-friendly features, makes it an essential tool for professionals in various fields. The combination of accuracy, flexibility, and durability solidifies its standing as a trusted choice for data acquisition and monitoring tasks.