Summary of Modem Operations

Modem Operations 6

Modem operations allow an RS-232 connection between an instrument and a PC via modems and telephone lines, instead of a direct RS-232 connection as described in Chapter 4, "Computer Operations." Due to the wide variety of modems available and their corresponding software, only the most common connection using a Hayes- compatible modem using the AT command set is described. This connection can be adapted to any configuration, following the basic rules in each procedure. A typical overall connection diagram is shown in Figure 6-1.

Hayes-compatible modems are both configured and controlled by commands from a PC. Since the Data Bucket does not have the capability to configure a modem, the modem is configured using a PC, then the PC is removed and the modem is connected to the Data Bucket. The modem operates in a simple answer mode since calls are never originated from the instrument. The modem configuration is stored in the modem memory. Some modems use an internal battery to prevent the erasure of the configuration if the modem power switch is turned off, while others lose all configuration when the power is turned off. Check the manual for your modem for an understanding of how the configuration is maintained.

The information in this chapter is provided in five parts:

∙Connecting the Modem to a PC for Configuration

∙Configuring the Modem for Modem Operations

∙Connecting the Modem to an Instrument

∙Configuring the Instrument for Modem Operations

∙Testing the RS-232/Modem Interface

				HYDRA
		PC
		HYDRA DATA BUCKET		REVIEW
				LAST	mA
					mA			CH
					mVDCAC
		COM	V		k Hz
			300V	FUNC ALRM		INTVL	FILES	REVIEW	SCAN
			MAX		RATE	CLOCK	MODE	CLEAR	SINGLE
				Mx+B CANCEL	ENTER	SHIFT	LIST	TOTAL	MON
						LOCAL	COMM	ZERO	TRIGS
						BUSY BATT
		TELEPHONE LINES
	MODEM			MODEM
RS-232	HS AA CD OH RD	TD TR MR		HS AA	CD OH RD	TD TR		MR	RS-232
RS-232									RS-232
									op59f.eps

Figure 6-1. Overall PC-to-Instrument Modem Connection

6-3

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.

Fluke 2635A user manual Summary of Modem Operations, Overall PC-to-Instrument Modem Connection

Models: 2635A

MAX

Figure 6-1. Overall PC-to-Instrument Modem Connection

2635A specifications