Manual

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Model 835-M Programmer’s

Manual

V1.1 2011

2.

Programming

the

Model 835-M

The

Model

835-M

can

be

accessed

though

LAN, USB,

or

GIPB

interface. All

interface

s

use standard

SCPI

command

set to

pass commands

to the device.

LAN

The

Model

835-M

signal

generator

can

be remotely programmed via a

10/100/1000Base-T LAN

interface and

LAN-connected computer using

one of

several LAN

interface

protocols.

The

LAN

allows

instruments

t

o

be

connected

together and

controlled

by a

LAN- based computer. LAN

and its

associated

interface operations are

defined in the

IEEE

802.2 standard.

The

Model

835-M

supports the following

LAN

interface protocols:

1) Socket based LAN:

the application programming interface

(API)

provided with

the

instrument

supports

general programming

using

the

LAN

interface under Windows operating system.

2) VXI-11

3)

Telephone

Network

(TELNET): TELNET is used

for interactive, one

command

at a time

instrument control.

4) Internet

protocol

optionally supported

For LAN

operation, the

signal

generator must be

connected

to the

LAN,

and an

IP address

must be

assigned

to the

signal

generator either manually or by

using DHCP

client

service.

Your system

administrator

can

tell you which method to

use.

(Most current

LAN

networks

use

DHCP.)

DHCP

Configuration

If the

DHCP server uses dynamic DNS

to link the hostname with the

assigned IP address,

the hostname may be

used

in

place

of the

IP address.

Otherwise, the

hostname is

not usable.

Ethernet Interface Connection and Setup

The

Model

835-M

fully

supports

the

IEEE-802.3 standard.

Most front panel

functions

(except

power

on/off)

can

be remotely

c

ontrolled via a network

s

erver

and an Ethernet

connection.

The

Model

835-M

software

supports

the

TCP/IP

network protocol.

Ethernet

uses

a

bus

or star topologie

s

where all of the interfacing

devices

are

connected

to a central

cable

called

the

bus,

or are

connected

to a hub. Ethernet

uses

the

CSMA/CD

access

method to handle

simultaneou

s

transmissions

over the

bus. CSMA/CD stands

for

Carrier Sense

Multiple Access/Collision Detection.

This standard

enables

network

devices

to detect

simultaneous

data

channel usage, called

a

collision

,

and

provides

for a

contention

protocol.

When a network

device detects

a

collision,

the

CSMA/CD standard dictates

that the data

will be retransmitted after waiting a random amount

of

time. If a

second collision is

detected, the data

is

again retransmitted after waiting twice

as

long. This

is

known

as

exponential

back

off.

The

TCP/IP

s

e

tup

require

s

the

following: