Input Strings, Input Terminators | Fluke 2625A, 2620A guide

2620A, 2625A

Users Manual

Input Strings

The instrument processes and executes valid input strings sent by the host. A valid input string is one or more syntactically correct commands, separated by semicolons (;), followed by an input terminator. ASCII and IEEE-488 bus codes are provided in Appendix B.

The instrument stores received input in a 350-byte input buffer.

Note

Input strings received over the RS-232 interface are not executed or checked for proper syntax until an input terminator is received. If the RS- 232 input buffer becomes full, a Device Dependent Error prompt is returned, and the input string is ignored.

The instrument accepts alphabetic characters in either upper- or lower-case. If a command cannot be understood (i.e, the equivalent of an IEEE-488 "Command Error"), the command and the rest of the command line are ignored.

Input Terminators

An input terminator is a character or command (IEEE-488.1), sent by the host, that identifies the end of a string of one or more commands.

When an input terminator is received (RS-232 applications), the instrument executes all commands entered since the last terminator was received, on a first-in, first-out basis. (In IEEE-488 applications, commands are not delayed until receipt of an input terminator; commands are executed as they are received.)

As input characters are processed and commands executed, space is made available in the input buffer for new characters. In RS-232 applications, if a communications error (e.g., parity, framing, overrun) is detected or the input buffer fills, a device-dependent error is generated. If the input buffer is full, new characters are ignored as the instrument waits for a termination character.

If, on the other hand, the input buffer becomes full when the IEEE-488 interface is used, the instrument stops accepting characters until there is room in the buffer. Characters in the input buffer cannot be overwritten with the IEEE-488 interface.

The following are valid terminators for the RS-232 interface:

∙LF (Line Feed)

∙CR (Carriage Return)

∙CR LF

∙LF CR

The following are valid terminators for the IEEE-488 interface:

∙EOI (End or Identity) on any character

∙LF (Line Feed)

In some instances, a terminator is automatically transmitted by the host at the end of the command string (i.e., the instrument’s input string). For example, in Fluke BASIC, the PRINT statement finishes with a CR LF pair.

Typical Input Strings

Example strings that could be sent to the instrument over either IEEE-488 interface are shown in Figure 4-3.

4-14

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.

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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.

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Fluke 2625A, 2620A user manual Input Terminators, Typical Input Strings

Models: 2625A 2620A