Appendix F

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 G-1 summarizes the cable requirements for all typical RS-232 connections; Figure G2 through G6 summarize instrument cabling diagrams; Figure G7 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

∙RS43 - Null modem with DB-9/female and DB-9/female 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.

F-1

Page 186 Page 188
Page 187
Image 187
Fluke 2620A, 2625A user manual RS-232 Cabling, Connections, Cables
Page 186 Page 188

2625A, 2620A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

Equipped with a large LCD display, the Fluke 2625A provides clear and user-friendly access to real-time measurement data. Its graphical interface allows users to visualize trends and monitor readings easily, which significantly enhances usability. The device supports a variety of input types and can connect to thermocouples, RTDs, and other sensors, offering great flexibility for various measurement tasks.

The Fluke 2625A employs advanced measurement technologies that ensure accuracy in data logging. With a high sampling rate, it captures fast-changing signals while maintaining data integrity. The device features a built-in memory that allows for extensive logging, accommodating long-term monitoring tasks without requiring constant oversight. Users can set it to log data at specified intervals, offering customizable solutions for different monitoring needs.

Another significant characteristic of the Fluke 2625A is its robust communication capabilities. The device supports USB and RS-232 interfaces for easy connectivity with computers and other devices, making data transfer and analysis seamless. This feature is especially beneficial for users who need to compile or analyze large sets of data quickly.

Furthermore, the Fluke 2625A is designed with durability in mind. Its rugged construction makes it suitable for challenging environments, including those with high levels of vibration, dust, or moisture. This reliability ensures that the device can withstand the rigors of fieldwork while still delivering accurate measurements.

In summary, the Fluke 2625A is a powerful data logger that combines versatility, accuracy, and reliability. Its user-friendly interface, advanced measurement technologies, and robust design make it an essential tool for professionals in various industries, from manufacturing and HVAC to research and development. Whether monitoring temperature changes in a laboratory or assessing voltage levels in an industrial setting, the Fluke 2625A stands out as a trusted solution for effective data logging and analysis.
Top Page Image Contents