Remote Operation; Interfaces; Retrofit Or Change The Interface; Commands Supported - Hameg HM8135 User Manual

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Manual (58 pages)

Table of Contents

Available languages

6 Remote Opera-

tion

6.1

Interfaces

The instrument is programmable by a PC. Functions and

ranges can be selected and measurement values stored in

the instrument can be read out. The dual interface USB/

RS-232 HO820 and the GPIB interface HO880 are electri-

cally isolated from the measuring circuit.

RS-232 Interface

Only three wire lines are connected inside:

❙ pin 2 = Txd (transmit data)

❙ pin 3 = Rxd (Receive data)

❙ pin 5 = Gnd (Ground)

Electric voltage on Rxd must be according to the RS-232

hardware standard (+12/-12 V max). This provides the ca-

pability to communicate with any PC computer via a COM

port. The communication protocol is a Xon/Xoff proce-

dure. The command #X1 activates a software handshake.

Now, the transmission between PC and interface is not

synchronised via the hardware handshake and operates as

follows.

XON = 11h = transmission continue

XOFF = 13h = transmission hold

Once the instrument has received a command line (re-

fer to the definition below), it sends the Xoff character (19

dec). After all commands (in the received line) have been

computed and executed, it sends the Xon character (17

dec), making the transmission of a new line possible. Com-

mands are the same for all interfaces (For more details

concerning the optional interfaces refer to the correspon-

ding manual).

With the receipt of a remote command, the display shows:

The user may return to local mode by pressing the context

sensitive keys

below the LOCAL option (all other keys

are locked). By sending the command LK1, the user may

lock all keys and in this case the display shows:

To establish a basic communication a serial cable (1:1) as

well as a terminal program is required.

USB interface

You do not have to change the configuration. If required,

the baud rate can be changed. Connect the HM8135 with

your PC using a USB cable and install the USB drivers like

described in the manual of the USB interface HO820.

GPIB interface

Connect the HM8135 with your PC using a GPIB cable. It

is necessary to set the GPIB adress of the HM8135 to the

desired value. The adress is changed at the interface on the

rear panel. Do this settings only before starting the instru-

ment. It is not possible when the instrument is running.

6.2

Retrofit or change the interface

If you wish to change or retrofit the remote interface of

the HM8135, please follow the manual of the interface for

the installation and jumper settings. In addition to these in-

structions, you need to program the HM8135 in order to

activate the new interface. Please send one of the follow-

ing commands over the extra built in RS-232 interface:

Interface

USB (HO870/HO820)

IEEE/GPIB (HO880)

RS-232 (HO890)

In order to deactivate all second interfaces please send:

813xcom2default:0

6.3

Commands supported

General

There are two kinds of commands. The first one is the set

of old commands which are HM8133-2 compatible. They

are normally understood by the instrument without chan-

ging existing programs. The second one is a new set with

a similar syntax to the SCPI standard. We recommend to

use these commands which are the only one described

hereafter. Commands are sent by lines to the instrument,

one line being a set of characters in ASCII code between

20 and 127 (dec), and terminated by an end of line termi-

nator (10 dec) or 13 following by 10 (dec). Each line is com-

posed of one or several simple commands (elementary)

separated one another by the ";" (semicolon) separator.

Example: :POWER 7 ; :FREQ 500E+6 ; :OUTP ON

The level is at +7 dBm, the frequency at 500 MHz and the

output signal ON. The strings of data are not case sensi-

tive. That means lower case and upper case are the same.

A simple command gives an access to a quantity or a

function of the instrument. All commands acting on the

same quantity are brought together in a tree structure. We

are going to detail function by function beginning with the

simplest and the most useful.

6.4

Commands description

Syntax conventions

The following syntax conventions are valid:

❙ lower cases in keywords are optional, for example the

keyword OUTPut may be transmitted as OUTP (short

writing) or OUTPUT (long writing)