Computer Interface Command Set, Xmodem File Transfers

2635A

Users Manual

For example, an STB byte of binary 00100000 (decimal 32) indicates an Event Status Bit. If the SRE register is set to binary 00100000 (using the command *SRE 32), then an Event Status Bit will cause the Logical OR gate to output a logic high, which automatically sets bit 6 to high via the MSS input. Therefore, a query of the STB register (command *STB?) would return decimal 96 (binary 01100000).

Other commands include *SRE?, which returns the decimal equivalent of the SRE byte. The command *CLS will clear all event registers. (See Appendix E for an 8-bit binary- coded decimal table.)

Bit

1,2,3

Name

IEB

not used

MAV

ESB

MSS not used

Table 4-3. Status Byte Register (STB)

Description

Instrument Event Bit. When any bit in the Instrument Event Register is set and the corresponding mask bit(s) in the Instrument Event Enable register is set, this Instrument Event Bit in the Status Byte will be set.

When read, the Instrument Event Bit is recomputed based on the new value from the Instrument Event Register and its mask, the Instrument Event Enable Register.

Always set to 0.

Message Available (ASCII bytes available for output). Event Status Bit

Master Summary Status Always set to 0.

Computer Interface Command Set

Table 4-4 is a summary of computer interface commands and queries. A detailed description of each command or query, with examples, can be found in Table 4-5. Sample programs that use the command set are shown in Figure 4-4 (GWBASIC), Figure 4-5 (QBASIC) and Figure 4-6 (Quick C). Program examples are provided on the Starter application software floppy disk.

Xmodem File Transfers

The FILE_TX and FILE_RX computer commands are used to transfer memory card files in binary format over the RS-232 interface. The protocol implemented for file transfers is XMODEM, an 8-bit block-oriented protocol using CRC or checksums for error checking. When receiving a file, the protocol attempts to do CRCs but will fall back to checksums if CRCs are not sent. When FILE_TX and FILE_RX are used with terminal emulators, the emulator must support the XMODEM protocol; for example, the PC Windows terminal emulator. The PC software must support both 128-byte and 1024-byte data blocks. Since XMODEM is an 8-bit protocol, no parity must be selected when configuring the RS-232 ports and XON/XOFF flow control cannot be used.

When a FILE_TX or FILE_RX command is issued, it returns an immediate execution error prompt (!>) if the file transfer can not be initiated. If this prompt is not returned, then the XMODEM transfer may begin (refer to the communications software being used for the procedure to send or receive a binary file). When the file transfer is complete, the => prompt is returned. If an unrecoverable error occurred, the !> prompt is returned. As with any XMODEM transfer, the last block received, if it is not an even multiple of 128 or 1024 bytes, is padded with nulls. See the FILE_RX and FILE_TX commands in Table 4-5 for more information.

4-18

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 Computer Interface Command Set, Xmodem File Transfers, Ieb, Mav Esb

Models: 2635A