National Instruments RMX-410 Series User manual

RMX-4102

LAN Interface User Manual
RMX-410x POWER SUPPLIES
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INSTRUMENTS

Contents
1 GENERAL INFORMATION
1.1 Introduction......................................................................................................................................... 4
1.2 Feature Summary .............................................................................................................................. 4
2 SPECIFICATIONS
2.1 Power Supply Specifications ......................................................................................................... 5
2.2 LAN Specifications............................................................................................................................ 5
2.3 LAN Command Speed..................................................................................................................... 7
3 SELECT THE CONTROL METHOD
3.1 Control Method Options................................................................................................................. 8
3.1.1 Select Local (Front Panel) Mode................................................................................................ 8
3.1.2 Select Serial (RS-232 & RS-485) Remote Mode .................................................................... 8
3.1.3 Select LAN Remote Mode ........................................................................................................... 8
3.1.4 Link LED ............................................................................................................................................. 9
3.1.5 Activity LED ...................................................................................................................................... 9
3.1.6 LAN Status LED................................................................................................................................ 9
4 CONNECT TO NETWORK
4.1 LAN Cable............................................................................................................................................ 10
4.2 Types of Networks ........................................................................................................................... 10
4.3 Power-up the LAN Power Supply............................................................................................... 11
4.4 IP Addresses ....................................................................................................................................... 11
4.5 Hostname............................................................................................................................................ 12
5 LAN SETUP
5.1 View the IP and MAC Addresses.................................................................................................. 13
5.2 Change the IP Address ................................................................................................................... 13
5.3 LAN Reset ........................................................................................................................................... 13
6 WEB PAGES
6.1 Benefit of Web Pages ...................................................................................................................... 15
6.2 Opening the HOME Page .............................................................................................................. 15
6.3 The HOME Page................................................................................................................................ 16
6.4 Login Rules ......................................................................................................................................... 16
6.5 DC Power Page.................................................................................................................................. 16
6.5.1 DC Power ➔Output Page.......................................................................................................... 16
6.5.2 DC Power ➔Protection Page................................................................................................... 17
6.5.3 DC Power ➔System Page ......................................................................................................... 17
6.5.4 DC Power ➔Utility Page............................................................................................................ 17
6.6 LAN Page............................................................................................................................................. 17
6.6.1 LAN ➔Configure Page ............................................................................................................... 17
6.6.2 LAN ➔Configure ➔Modify Page .......................................................................................... 18
6.6.3 LAN ➔Advanced Page............................................................................................................... 19
6.6.4 LAN ➔Advanced ➔Modify Page .......................................................................................... 19
6.6.5 LAN ➔Users Page ........................................................................................................................ 19
6.7 HELP Page ........................................................................................................................................... 19
7 PROGRAMMING USING VISA DRIVERS
7.1 VISA Description................................................................................................................................ 20
7.2 VXI-11 Compatibility ........................................................................................................................ 20
7.3 Opening the VISA Connection..................................................................................................... 20
7.4 Communicating Using VISA ......................................................................................................... 20

8 PROGRAMMING USING IVI DRIVERS
8.1 IVI Description ................................................................................................................................... 21
8.2 IVI Support.......................................................................................................................................... 21
9 PROGRAMMING USING SOCKETS
9.1 Socket Description ...........................................................................................................................22
9.2 Communicating Using Sockets ..................................................................................................22
9.3 Controller Access: Single and Multiple Clients ......................................................................22
9.4 Input Buffer Requirements ...........................................................................................................22
9.5 Message Terminators......................................................................................................................23
9.6 Using TCP Sockets ........................................................................................................................... 23
9.7 Using UDP Sockets .......................................................................................................................... 23
10 CONNECTING OVER WAN
10.1 View Web Pages Over WAN........................................................................................................ 24
10.2 Use Sockets Over WAN................................................................................................................. 24
11 COMMAND SET
11.1 Lan Specific Commands............................................................................................................... 25
11.1.1 Read the Hostname.....................................................................................................................25
11.1.2 Read the IP Address.................................................................................................................... 25
11.1.3 Read the MAC Address .............................................................................................................. 25
11.1.4 Reset the LAN Settings.............................................................................................................. 25
11.1.5 Blinking the Identity LED.......................................................................................................... 25
12 RS-485 MULTI-DROP COMMANDS
12.1 Introduction ..................................................................................................................................... 26
12.2 Configure the LAN Supply.......................................................................................................... 26
12.2.1 To Set Up the Master Power Supply:.................................................................................... 26
12.2.2 To Set the RS-485 Address: ..................................................................................................... 26
12.3 Connect and Configure the RS-485 Supplies ...................................................................... 27
12.3.1 To Set Up an RS-485 Chain ...................................................................................................... 27
12.4 Multi-drop Programming Using SCPI Commands ............................................................. 27
12.4.1 Selecting One Power Supply in a Multi-drop Chain.......................................................27
12.4.2 Global Commands in a Multi-drop Chain.......................................................................... 27
12.4.3 Selecting a Supply...................................................................................................................... 27
12.4.4 Global Set the Voltage Limit................................................................................................... 28
12.4.5 Global Set the Current Limit................................................................................................... 28
12.4.6 Global Set the Output ON or OFF.........................................................................................28
12.4.7 Global Reset Power Supplies.................................................................................................. 28
12.4.8 Global Save All Settings............................................................................................................28
12.4.9 Global Recall All Settings ......................................................................................................... 28
13 TROUBLESHOOTING .............................................................................................29

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1 GENERAL INFORMATION
1.1 Introduction
The Local Area Network (LAN) option for the RMX-410x series power supply allows the user to
remotely program, measure and check status of the power supply.
A computer web page browser can be used to operate the power supply through a built-in web
page server. For applications including factory and test automation, communication is made using
several standard network protocols and instrument commands.
Refer to the RMX-410x User Manual for information on installing the power supply, safety
requirements, specifications, connecting the power-in and out, operating the front panel, using
the serial (RS-232/485) programming and analog programming.
1.2 Feature Summary
• Communicate over any standard TCP/IP network
A. LAN (Local Area Network)
B. WAN (Wide Area Network)
C. Communicate worldwide using the Internet
• Web page viewable with any web page browser, such as Internet Explorer
D. Configure the network connection settings
E. Active web page (GUI) that programs and reads the power supply output and status
F. Security settings to block multiple controllers and risky protocols
G. Optional password protection prevents unauthorized operation
• LAN Protocols
H. VISA drivers, TCP and UDP sockets are supported
I. VXI-11 Discovery and ping server are supported
J. A “LAN Status” indicator shows when the network connection is established
K. Easily write custom automation programs
L. IVI.COM and IVI.C drivers are available for download.
• Full remote programming functions
M. Uses SCPI command language, an instrumentation standard
N. Compatible with VISA drivers and all the test & measurement utilities
O. TCP and UDP sockets will support PLCs, Linux and other non-VISA controllers
• Front Panel features
P. View IP and MAC address on front panel
Q. Set the complete IP address on front panel
R. LAN Reset on front panel
S. User may remotely “Blink” the front panel to locate a power supply in a rack
• Rear Panel features
T. Ethernet RJ-45 connector (standard 8-pin phone jack for LAN)
U. Link and Activity LED on RJ-45 connector
V. LAN Status LED shows LAN fault and is a 2nd “Blink Identify” on rear panel
• RS-485 Multi-drop Chain
W. Allows connecting up to 30 power supplies using simple Link cable
X. One LAN IP address shared by all RS-485 power supplies
Y. The LAN option is not needed in RS-485 power supplies
Trademark Notices
Microsoft and Windows are trademarks of Microsoft Corporation.

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2 SPECIFICATIONS
2.1 Power Supply Specifications
When using the LAN, the power supply ratings and accuracies are the same as for the digital
remote programming using RS-232 or RS-485. Refer to the RMX-410x Power Supply User Manual
for the specifications.
2.2 LAN Specifications
ELECTRICAL
Ethernet Meets IEEE 802.3u specifications
Auto-MDIX Accepts patch or cross-over cable connection
Auto-Negotiate Selects fastest of 10Base-T or 100Base-T networks
(10 or 100 Megabits per second)
NETWORK CONFIGURATION
MAC Address NI assigned: 00:19:f9:xx:xx:xx
IP Address View or set from front panel
DHCP Get address from network server. Leasing services
Auto-IP Create own IP address: 169.254.xxx.xxx
Static IP Any IP fixed by operator
Hostname NetBIOS protocols. Operator settable name
Duplicate IP Detection Reject duplicate setting or disconnect from network
Subnet Mask Mask set by DHCP or static
Default Gateway Address set by DHCP or static
DNS Server Address set by DHCP
LAN Reset Reset configuration from front panel or SCPI command
LAN PROTOCOLS
TCP LAN packets follow Transmission Control Protocol
IPv4 Internet Protocol version 4
Instrument Protocols
VXI-11 Supports Core channel, not Abort or Interrupt channels
VISA VXI-11 compliant, uses RPC and Portmapper, SCPI commands
TCP Sockets Send SCPI commands to port 8003
UDP Sockets Send SCPI commands to port 8005
VXI-11 Discovery Find connected instruments
SNMP Ping Server Verify LAN connection to instrument
HTTP Web page server with Java scripts and applets
COMMANDS
SCPI SCPI 1999 compliant command, measure and status
IEEE-488.2 Condition and event register tree

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WEB PAGES
Multiple users Multiple web pages can be open at the same time
Identity Identify power supply model, serial number, revision etc.
LAN Configuration View and set LAN configuration
Active Control GUI Program and read output settings
Send Commands Send SCPI commands, read errors
Help Link to NI web sites
SUPPLY CONFIGURATIONS
Local Control Supply may be run from front panel even if LAN is monitoring
LAN Remote Control Supply may be controlled and monitored through LAN
RS-232/485 Control LAN must be disabled to use the standard RS-232/485 ports
Analog Control LAN may monitor supply while analog controller sets output
Series / Parallel Supplies Rules for standard RMX-410x supplies apply to LAN supplies
Advanced Parallel Rules for standard RMX-410x supplies apply to LAN supplies
INDICATORS
IP and MAC Address View addresses on front panel
Multi-drop Address View RS-485 address on front panel
Link LED Indicates that the Ethernet cable is connected at both ends
Activity LED Indicates when LAN packets are detected
LAN Status LED Red/green, indicates power supply has valid IP connection
Blink Identify Find the supply by remotely blinking front and rear LEDs
Local/Remote LED Indicates if LAN has control of supply output
SWITCHES, ENCODERS
LAN Reset Reset LAN settings from front panel
IP Address Change entire IP address from front panel
Multi-drop Address Change RS-485 address from front panel
LAN/ RS Select Disable LAN to enable RS-232/485 or Multi-drop slave
SECURITY
Web Page Password Can set password to prevent unauthorized or accidental changes to LAN
settings or power supply output settings
Single Client Only Set to prevent multiple programs from taking control
Block UDP Sockets Single client will block attacks through UDP sockets
Disable VXI-11 Discovery Stop intruders from finding the power supply
Disable Ping Server Stop intruders from finding the power supply

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2.3 LAN Command Speed
The following communication speeds are typical values only. In addition to the variability
in the RMX-410x LAN interface, there are timing variations within the controller and the
network routing.
The following speed specifications are subject to change without notice.
VISA Drivers, Sockets
Typical Command or query speeds:
All commands and queries have a response time in the range of 45~50ms.

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3 SELECT THE CONTROL METHOD
3.1 Control Method Options
The power supply with the LAN option installed, may be operated through four interfaces. This
section describes how to enable each option.
MODE MODE DESCRIPTION
1 LAN Control using an Ethernet connection LAN will disable the J4-IN serial port
2 Local Control using the front panel encoders and buttons LAN can be used to measure and read
3 Serial Control using RS-232 and RS-485 through J4-IN and
J4-OUT connectors
Serial will disable the LAN port
4 Analog Control using analog signals through J1 and J3
connectors
LAN, local or serial may still be used to
measure and set protections
3.1.1 Select Local (Front Panel) Mode
The power supply may be operated in local or analog control mode even when a computer is
using the LAN connection.
When the power supply is in remote mode, the front panel “REM” LED is ON. The power supply
may be returned to local mode by pressing and releasing the“REM” button.
If the “REM” button will not go into local mode, then:
• The LAN is being used to change settings, the power supply will automatically go to
remote with every command. Stop the LAN program and then press the “REM” button.
• The LAN computer may have sent a Local Lockout command. Use the LAN to send
“SYSTem:REMote[:STAte]” (refer to RMX-410x supply User Manual) or turn the power
supply AC off and on again, and then press the “REM” button.
3.1.2 Select Serial (RS-232 & RS-485) Remote Mode
The serial (RS-232 & RS-485) remote control may be selected even if the LAN option is installed.
To select the RS-232 & RS-485 mode:
1. Press “REM” button on the front panel.
2. Voltage Display will show 'INtF". Press the Voltage encoder.
3. Rotate the Current encoder to select "232 or 485" and then press the Current encoder.
3.1.3 Select LAN Remote Mode
Selecting the LAN mode will allow programming over the Ethernet cable. Any settings and
measurements may be done from a remote computer using the power supply’s built-in web
pages or using SCPI programming.
To select the LAN mode:
1. Press “REM” button on the front panel.
2. Voltage Display will show 'INtF". Press the Voltage encoder.
3. Rotate Current encoder to select "LAn" and then press the current encoder.

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LAN Option Rear Panel View
The power supply rear panel, with the LAN option installed, is shown below.
1. Link LED
2. Activity LED
3. RJ-45 Socket
4. LAN Status LEDS
3.1.4 Link LED
LED embedded in the RJ-45 socket glows green when the connection is made to an active network.
3.1.5 Activity LED
Amber LED blinks when any message packets are detected.
3.1.6 LAN Status LED
There are two LED's at the bottom of the RJ-45 connector:
• Normal Operation: Steady green
The power supply has an active LAN connection
• Device Identify: Blinking green
The identify function is turned on from a remote computer using the web page or a
SCPI command. The front panel blinks along with the rear. It is used to identify one
power supply in a rack of instruments. The blinking is turned off by the web page, by
sending another SCPI command, or by changing any front panel control. In a multi-
drop chain, only the master LAN supply blinks.
• LAN Fault: Steady red
Shows the LAN mode is not enabled, the LAN connection was never made, or that the
LAN connection was made and then broken.
Fig.3-1: Rear Panel LAN Features

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4 CONNECT TO NETWORK
4.1 LAN Cable
The LAN cable must be supplied by the customer. It may be a standard straight “patch”CAT-5 (or
better) network cable or it may be a “crossover” cable where the pins are reversed on one end.
The cable type is auto-detected by the power supply.
The serial link cable (0.5 m long) provided with the RMX-410x power supply cannot be used for
a LAN connection.
4.2 Types of Networks
There are basically two types of networks that are discussed here:
1. NETWORK WITH A SERVER
This is the typical local area network with a server computer and network administrator to
keep it operating. The server will download the IP address and other settings to the power
supply.
2. PEER-TO-PEER NETWORK
This is typically the configuration when you connect the RMX-410x power supply directly to
a computer that is not a network server. The power supply will configure its own IP address
and other settings.
Fig.4-1: Server Network Connection Diagram
Fig.4-2: Peer-to-Peer Connection Diagram

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4.3 Power-up the LAN Power Supply
The RMX-410x power supply LAN option automatically detects if it is connected or disconnected
from a network. It will also automatically look for a network server and it will retrieve or create an
IP address. It will also broadcast its IP address and hostname to all other devices on the network.
1. Turn ON the power supply AC power.
“Lan” appears for about 2 seconds on the front panel display. Then “OFF” or the last output
settings will appear on the front panel display.
2. The LAN cable may be connected before or after the power supply is switched on.
3. For a server network, wait about 10 seconds.
The rear panel LAN Status LED turns green.
4. For a peer-to-peer network, wait about 30 seconds.
The rear panel LAN Status LED turns green.
When the LAN Status LED turns green, the power supply receives the IP address. It can be viewed
on the front panel. See section 5.1.
If the LAN Status LED does not turn green, refer to section 13 for troubleshooting steps.
4.4 IP Addresses
The simplest and most reliable way to open a network connection is via power supply’s IP address,
which is represented by group of four numbers separated by periods (for example: 10.1.15.123).
This IP address may be viewed from the front panel (see section 5.1).
Three modes in which the power supply can access an IP address, is shown below:
IP Address DHCP Auto-IP Static IP
Mode Select
DHCP is default after “LAN Reset”
Default after “LAN Reset” if no
DHCP server is used
May be set in the “LAN Modify”
web page (see section 6.6.2) or
by setting the IP1-4 address on
the front panel
(see section 5.2)
Assignment Assigned by the network server Assigned by the power supply
Assigned in the“LAN Modify”
web page (see section 6.6.2) or
by setting the IP1-4 address on
the front panel
(see section 5.2)
Range Any address 169.254.xxx.xxx Any address
Lifetime
Address may change as
the DHCP server assigns
addresses dynamically to many
instruments
Fixed for the power supply,
except if an address collision is
detected
Always fixed for the power
supply
Duplicate
Addresses
The DHCP server should
prevent duplicate IP addresses
Finds another available auto-IP
address
The LAN Status LED and Front
Panel blink.

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4 . 5 H o s t n a m e
The hostname is a text address instead of a numeric address. This address mode is less common
than the IP address because the hostname cannot be viewed from the front panel, and because
a naming service (such as NetBIOS) must be running in the LAN computer.
A custom hostname can be created through the web pages (see section 6.6.2).
For example, you can change the hostname to “NATI”. The control program can then send a
command to "NATI".
After a “LAN Reset” is done (see section 5.3), the power supply will create a default hostname
based on the model and serial number of the power supply.
The default hostname is in the format:
< Product > < Voltage rating > – < Current rating > – < last 3 digits of serial number >
If the rating has decimal point, substitute “P” for the decimal point.
NOTE:
Two power supplies should not have the same Host Name
if Host Name is used for Communication.

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5 LAN SETUP
5.1 View the IP and MAC Addresses
When the power supply is operating with the LAN enabled, the IP and MAC addresses may be
viewed on the front panel by following these steps:
To view the IP address:
1. Press the Remote switch. Move the Voltage Encoder until "IP" is seen on the Voltage Display.
2. Press the Voltage encoder and move the encoder to view the IP address. The voltage display
will show IP1-IP4 as you move the encoder. The current display will show the required IP.
To view the MAC address:
1. Press the Remote switch. Move the Voltage Encoder until "mAC" is seen on the Voltage Display.
2. Press the Voltage encoder and move the encoder to view the MAC address. The voltage display
will show mAC1- mAC6 as you move the encoder. The current display will show the required MAC.
5.2 Change the IP Address
The LAN allows you change all four numbers (octets) of the IP address from the front panel.
The IP address has four numbers (ex:“10.97.4.4”). Each number may be set to any value from 1-254.
To change the IP address:
1. Press the remote button. Move the Voltage Encoder until IP is seen on the Voltage Display
2. Press the Voltage encoder and then move the encoder to view the IP address. The voltage
display will show IP1-IP4 as you move the encoder. The Current display shows the required IP
address. Move the Current encoder to change the IP address and then press the encoder.
3. ‘LAn’ will be shown on Voltage Display and ‘HOLd’ will be shown on Current Display for about
1 sec.
4. If another device is using the same address you want to set, the front panel LED will blink,
and the address will revert to it’s previous status. Press any button to stop the blinking.
When you change the IP address from the front panel or ( LAN>Cofigure>Modify Page),the RMX-
410x LAN will switch to STATIC addressing. ( DHCP and Auto-IP addressing will be disabled)
5.3 LAN Reset
To reset the power supply to the factory default LAN settings:
1. Press the remote button. Move the Voltage Encoder until "rST" is seen on the Voltage Display.
2. Press the Voltage encoder. rST will be seen on the current display.
3. Press the Current encoder to reset the system.
4. ‘LAn’ will be shown on Voltage Display and ‘HOLd’ will be shown on Current Display for about 1 sec.
5. It may be required to toggle the AC ON/OFF switch.

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The default LAN settings are:
DHCP is enabled
If DHCP fails to get a lease, the auto-IP settings will be obtained:
IP address: 169.254.xxx.xxx
Subnet mask: 255.255.0.0
Default gateway 0.0.0.0
DNS Server 0.0.0.0
Description: “
RMX Rackmount Power Supply”
Controller Access One Client Only
Ping Server: Enabled
Keep-Alive 1800 Seconds (30 minutes)
Auto-Negotiate: Automatically select network speed
VXI-11 Discovery Enabled
Password: None

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6 WEB INTERFACE
6.1 Web Interface Overview
The RMX-410x web pages are useful for:
• Reading the power supply model, identity, revision and LAN setup information
• Configuring the LAN connection
• Programming and reading the power supply DC output
6.2 Opening the HOME Page
Once the rear panel LAN Status LED has turned green (see Section 4.3), you may open the RMX-
410x web page.
1. Read the IP address from the front panel (refer section 5.1 for details).
2. Open a web page browser program such as Internet Explorer. Enter the power supply IP
address as shown below. Click the “GO” button
The power supply Home page will appear. If it does not, refer to section 13 Troubleshooting.
3. Alternately, the hostname may be used for addressing the web page as shown below (if the
power supply is set for “DHCP/Auto-IP”, and if the NetBIOS naming service is running on
the computer). See Section 4.5 for a description of the hostname.
The power supply Home page will appear. If it does not, refer to section 13 Troubleshooting.

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6.3 The HOME Page
The following page appears when the web page is first opened or when it is refreshed:
VISA Name Using IP Address
For automation programming, VISA is a type of communication driver. For LAN instruments, the
IP address may be used in the VISA resource descriptor. See section 4.4.
VISA Name Using Hostname
For automation programming, an alternate VISA resource descriptor using the power supply
hostname. Refer section 4.5
RS-485 Address
This address only applies to a multi-drop chain of power supplies. The RS-485 address of the LAN
supply is also called the master supply.
Hostname
A unique name for a device on a network. The default hostname is described in section 4.5 and
it is configured in section 6.6.2. If the hostname is not registered with the network name server,
then the IP address will be shown here.
Auto-MDIX
The LAN will automatically detect if a patch or cross-over LAN cable is used.
Auto-Negotiate
The LAN will automatically adjust to the fastest speed available.
Logging In
To change power supply output or the LAN settings, a user must first log in.
Click the “Login” button at the bottom-left side of the web page and a window appears.
The only acceptable user name, “admin”, is shown. By default, password is empty. Click “Login”.
The password may be set or removed on the LAN -> Users web page.
A front panel LAN Reset will clear the password (see section 6.6.5)
6.4 Login Rules
•Any number of users may view the web pages of a power supply at the same time. However,
the update rate becomes slower as more web pages are opened.
•Only one user at a time may be logged-in to modify the power supply settings.
•If an automation program with VISA is running, then you may view the web pages but you
cannot login to change settings.
•If a user is logged in, then a VISA or socket connection cannot be opened by an automation
program.
•A user may logout by clicking the “Logout” button, by closing the web browser or by leaving
the web browser idle for “LAN Keep-alive” seconds (see section 6.6.3).
•If a web page is “Logged-in” another copy of the web page can not be opened.
•If an automation program with socket is running, you can not open the Web Page.
6.5 DC Power Page
When the “DC Power” tab is selected, the“Output” soft front panel (GUI) loads first.
Refresh List
When this button is clicked, the web page will scan to find connected Multi-drop power supplies
and put the discovered addresses into the list box. This button only applies to a multi-drop chain
as described in section 12. It is required to click the button after clicking the DC power button,
connecting or disconnecting a power supply, or changing the 485 address. Please wait 3 ~ 4
seconds before clicking the refresh button.

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Select RS-485 Multi-drop Address
This address is described in section 12. This address only applies to a multi-drop chain of RS-485
supplies. If there is no multi-drop, only the address from the single LAN supply is available.
Blink Identify
When this button is clicked ON, the selected power supply front panel blinks and the rear panel LAN
LED blinks.This function allows you to quickly identify which power supply is being communicated
to in a rack of instruments. In a multi-drop chain, only the master LAN power supply will blink.
The blink identify is turned OFF by clicking this button again or by operating any knob or button
on the power supply front panel or by SCPI command.
Measurements
This section displays the selected power supply’s actual output voltage and current and the operating
mode (constant-voltage or constant-current or off). Also, faults are shown in the voltage display.
Settings
This section displays the selected power supply’s voltage and current limit (as if they were set on
the front panel encoders) and output ON/OFF settings. To make settings, click 'Check to Modify'.
After settings are made, click Apply. To view the actual settings deselect ‘Check to Modify’.
6.5.2 DC Power ➔Protection Page
Under the“DC Power”tab, a“Protection”button is available at the top of the panel. When opened,
the window allows you to view and set four protections.
A. Over-Voltage Protection Limit
B. Under-Voltage Limit
C. Foldback Protection
D. Auto-Start or Safe-Start
E. In a multi-drop chain, these settings affect only the supply selected in the RS-485 address
list box.
6.5.3 DC Power ➔System Page
Under the “DC Power” tab, a “System” button is available at the top of the panel. When clicked,
a window opens that allows you to operate four functions:
A. Reset One Instrument (this resets only the supply selected in the RS-485 address list box)
B. Reset All Instruments (this resets the supplies connected to the multi-drop bus)
C. Save (this saves the settings for only the supply selected in the RS-485 list box)
(settings are saved to default location 1)
D. Recall (this recalls the settings for only the supply selected in the RS-485 list box)
(settings are recalled from default location 1)
6.5.4 DC Power ➔Utility Page
This page is used to send any SCPI command and see the response. It is a learning tool for SCPI
operation and it allows commands which are otherwise not on the web pages.
Type any SCPI message into the top text box. Then click the“Send and Read” button.
For commands, there is no response. For queries, the response appears in the middle text box.
You may read any System Error message by clicking the “Read Errors”button. The error message
(or“No error”) appears in the bottom text box. To read system error, first send SYST:ERR:ENAB.
6.6 LAN Page
When the “LAN” tab is clicked, the following web page opens. This page and its sub-pages allow
you to view and configure the power supply’s LAN settings.
6.6.1 LAN ➔Configure Page
When the “LAN” tab is selected, the“Configure” panel opens:
The following settings are shown on the“LAN ➔Configure” web page:

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IP Address Source
Displays the way the IP address was selected. Options are DHCP/Auto-IP and Static IP.
IP Address
Displays the IP address assigned to the power supply through either DHCP, Auto-IP or Static IP
sources.
Subnet Mask
Displays the subnet mask assigned to the power supply through either DHCP, Auto-IP or Static IP.
Default Gateway
Address of the network router to allow the power supply to communicate outside of the local subnet.
DNS Server
Address of the server running the Domain Naming Service. This is used for hostname addressing.
Hostname
The power supply hostname may be used instead of the IP address to create a communication link.
The default hostname is derived from the model and serial number (see the hostname in section
4.5 and 6.6.2) or it may be changed in the “LAN ➔Configure ➔Modify” web page
Description
By default, this is“RMX Rackmount Power Supply”, but it may be changed in the“LAN ➔Configure
➔Modify” web page
Controller Access
The“One Client Only”setting is the default setting for the highest networking security.This setting
allows only one TCP socket to be open at a time and it disables the connectionless UDP sockets.
See section 6.6.2.
Modify
Click this button to open the window shown below
6.6.2 LAN ➔Configure ➔Modify Page
If you are logged in and clicked the“Modify”button on the“LAN ➔Configure”window, the below
pop-up window appears. On this window, you may enter new values for the LAN settings. The
available fields depend on the selection of “DHCP Assigned / AUTO IP” or “Static IP”. Changes to
these setting will not take place until the “Apply” button is clicked.
NOTE:
After changing the LAN settings, the web browser will ask to be closed. Re-open using the new address.
If the change causes a duplicate IP, the LAN Status LED and the front panel LED will blink and address
will revert to previous state. Press any front panel button to stop the blinking.
NOTE:
It may be required to AC reset the power supply after changing the LAN settings.
TCP/IP Mode
This selects how the power supply receives network settings. Select either:
•DHCP Assigned / AUTO IP: If this mode is selected, the network server uses DHCP to assign
the IP address, subnet mask, default gateway and DNS server. Since the server assigns these,
they are disabled (gray) on the web page. If the server cannot make the assignment, the power
supply will revert to the Auto IP method described in section 4.4. In this mode, the user may
only change the hostname and description.
•Static IP: If this mode is selected, the IP address, subnet mask and default gateway must be
entered in the window fields. The settings must be compatible with the requirements of the
network server. These settings do not change as the power supply is moved to different LAN

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connections. In this mode, there is no hostname connectivity so the hostname and DNS
server fields are disabled (gray).
Controller Access
Select the security feature for One Controller Only or Multiple Clients. The multiple clients setting
is needed to allow more than one controller connection at a time and to enable UDP socket
connections.
6.6.3 LAN ➔Advanced Page
Click the “LAN ➔Advanced” button to view and set four advanced LAN settings:
LAN Timeout
If you are logged in this is how many seconds the web pages may be inactive (idle) before the
power supply automatically logs you out.
The default is 1800 seconds = 30 minutes.
Ping Server
‘Ping’ is a network utility that allows the computer to verify communication with the LAN power
supply. This service may be disabled in the “Modify” panel.
Auto-Negotiate
This shows the network speed that the LAN card is allowed to operate at.
VXI Discovery
This is a protocol which allows the network server to detect what instruments are connected to
the LAN. It may be disabled in the “Modify” panel for security reasons.
Auto-MDIX
This service is always enabled in the power supply. The power supply LAN connection will always
detect a patch or cross-over cable.
Modify
After logging in, click this button to open the Modify page.
6.6.4 LAN ➔Advanced ➔Modify Page
In the window below, you may enter new values for the LAN settings. Changes to these setting
will take place when the “Apply” button is clicked.
6.6.5 LAN ➔Users Page
This page allows you to create password protection for the web pages. There is no password
protection for automation programming with VISA or sockets.
By default, the “old password”is blank. The new password must be four or more characters long.
Special Characters and spaces not allowed.
Reset the password
Once a password is applied, it may be changed by using the same screen, but it can only be removed
by performing the “LAN Reset” function from the power supply front panel or SCPI command.
6.7 HELP Page
A Help tab is available. This page is a set of Internet links to NI’s website pages.