HP 1650B User Manual

Programming Over RS-232C 3
Introduction This section describes the interface functions and some general concepts
of the RS-232C. The RS-232C interface on this instrument is
Hewlett-Packard’s implementation of EL4 Recommended Standard
RS4!32C, “Interface Between Data Terminal Equipment and Data
Communications Equipment Employing Serial Binary Data Interchange.”
With this interface, data is sent one bit at a time and characters are not
synchronized with preceding or subsequent data characters. Each
character is sent as a complete entity without relationship to other events.
Interface
Operation
The HP 1650B/51B can be programmed with a controller over RS-232C
using either a minimum three-wire or extended hardwire interface. The
operation and exact connections for these interfaces are described in
more detail in the following sections. When you are programming an HP
1650B/51B over RS-232C with a controller, you are normally operating
directly between two DTE (Data Terminal Equipment) devices as
compared to operating between a DTE device and a DCE (Data
Communications Equipment) device. When operating directly between
two DTE devices, certain considerations must be taken into account. For
three-wire operation, XON/XOFF must be used to handle protocol
between the devices. For extended hardwire operation, protocol may be
handled either with XON/XOFF or by manipulating the CTS and RTS
lines of the RS-232C link. For both three-wire and extended hardwire
operation, the DCD and DSR inputs to the HP 1650B/51B must remain
high for proper operation. With extended hardwire operation, a high 0;
the CTS input allows the HP 1650B/51B to send data and a low on this
line disables the HP 1650B/51B data transmission. Likewise, a high on the
RTS line allows the controller to send data and a low on this line signals a
request for the controller to disable data transmission. Since three-wire
operation has no control over the CTS input, internal pull-up resistors in
the HP 1650B/51B assure that this line remains high for proper three-wire
operation.
HP 1650B/HP 16518 Programming Over RS-232C
3-l

HP 1650B Specifications

General

Category	Logic Analyzer
Model	1650B
Number of Channels	80
Maximum Clock Rate	100 MHz
Glitch Trigger	Yes
Transitional Timing	Yes
Display	CRT

Summary

Chapter 1 Introduction to Programming an Instrument

Programming Syntax and Concepts

Explains command format, structure, headers, parameters, and syntax rules for instrument control.

Instrument Programming Basics

Covers initialization, example programs, data retrieval, and response formats.

Chapter 2 Programming Over HP-IB

HP-IB Interface Concepts

HP-IB Communication and Control

Chapter 3 Programming Over RS-232C

RS-232C Interface Overview

RS-232C Communication Details

Chapter 5 Common Commands

Overview of Common Commands

Key Common Commands

Details essential commands like *CLS, *ESE, *IDN, *RST for status and identification.

Chapter 6 System Commands

System Command Overview

Key System Commands

Details core commands like ARM, DATA, LOCKout, LONGform, STARt, STOP.

Chapter 7 MMEMory Subsystem

File Management Commands

Covers AUToload, CATALOG, COPY, DOWNLOAD, LOAD, PACK, PURGE, RENAME, STORE, UPLOAD.

Chapter 10 MACHine Subsystem

Machine Configuration Commands

Covers commands like NAME, TYPE, ARM, ASSign for machine setup.

Chapter 11 SFORmat Subsystem

State Format Configuration

Details SFORmat selector and commands like CLOCK, CPERiod, LABel.

Chapter 12 STRace Subsystem

State Trace Qualification

Details BRANch, FIND, PREStore, RESTart for trace sequence control.

Chapter 13 SLISt Subsystem

State Listing Configuration

Details commands like COLumn, DATA, LINE, MMODE, PATtern for listing setup.

Chapter 14 SWAVeform Subsystem

Waveform Display Configuration

Details ACCumulate, DELay, INSert, RANGe, REMove for waveform display setup.

Chapter 16 COMPare Subsystem

Compare Data Configuration

Details CMASk, COPY, DATA, FIND, RANGe, RUNTil for comparison setup.

Chapter 17 TFORmat Subsystem

Timing Format Configuration

Details LABel, REMove, THReshold for timing format setup.

Chapter 18 TTRace Subsystem

Timing Trace Configuration

Details AMODe, DURation, EDGE, GLITch, PATTern for timing trace setup.

Chapter 19 TWAVeform Subsystem

Timing Waveform Configuration

Details ACCumulate, DELay, INSert, MMODe, OCONdition for waveform setup.