Computer Operations 4

Testing the Instrument/PC RS-232 Interface

ALM:15 DIO:255 TOTAL:0

To decode the printout, see Figure 5-3.

The commands in the above example can be combined into a single entry by using the semicolon separator character:

*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG.

6.One of the following three possible prompts are returned when a command is sent to the instrument:

=>

The command was executed [Example, PRINT 1].

!>

The command was recognized, but not executed [Example, PRINT 3, where

 

only PRINT 0 and PRINT 1 are legal entries].

?>

The command wasn’t recognized [Example, PRITN 1, spelling error].

7. Exit the communications program and return to DOS, as required.

Testing the RS-232 Interface Using Gwbasic

Complete the procedure below to test the RS-232 link between the PC and instrument using GWBASIC interpreter commands. Identify the PC COM port used for the RS-232 link (COM1 is assumed).

1.Configure the Data Bucket communication parameters, as described in Figure 4-2, for bAUd = 9600, PAR = no, CtS = OFF, and Echo = On.

2.Turn on the PC and enter GWBASIC to start the BASIC interpreter.

3.With the entry screen displayed, enter the following commands (which are executed immediately). The last command returns an identification string and execution prompt:

OPEN "COM1,9600,N,8,1,CS,CD" FOR RANDOM AS #1

OK

PRINT #1, "*IDN?"

OK

PRINT INPUT$ (46, #1) IDN?

FLUKE,2635A,0,Mn.n An.n Dn.n Ln.n =>

Mn.n identifies the main software version.

An.n identifies the analog-to-digital converter software version. Dn.n identifies the display software version.

Ln.n identifies the programmable gate-array configuration version.

If the identification string was not returned, be sure the instrument RS-232 port is configured for Echo = On (Figure 4-2). Verify that the commands were exact. For example, entering PRINT #1, "*IDN" instead of PRINT #1, "*IDN?" will hang up the program. Press <CNTL><BREAK> to escape, then re-enter the commands. If the wrong characters appear, there is an incompatibility in the COM port configurations (baud rate, parity, etc.). If everything seems normal, but characters still don’t appear, check the RS-232 connection cable (see Appendix D).

4-9

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Fluke 2635A user manual Testing the RS-232 Interface Using Gwbasic, Open COM1,9600,N,8,1,CS,CD for Random AS #1
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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.
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