RTA 435USB-NNAU Specification sheet

Real Time Automation®
1
1-800-249-1612
435USB-NNAU
USB to PLC Gateway
Product User Guide
Revision: 8.09
Platform: NNAU

Real Time Automation®
2
1-800-249-1612
Trademarks
CompactLogix, ControlLogix, & PLC-5 are registered trademarks of Rockwell Automation, Inc. EtherNet/IP is a trademark of the
ODVA. MicroLogix, RSLogix 500, and SLC are trademarks of Rockwell Automation, Inc. Microsoft, Windows, and Internet Explorer
are registered trademarks of Microsoft Corporation. BACnet®is a registered trademark of American Society of Heating, Refrigerating
and Air-Conditioning Engineers (ASHRAE). All other trademarks and registered trademarks are the property of their holders.
Limited Warranty
Real Time Automation, Inc. warrants that this product is free from defects and functions properly.
EXCEPT AS SPECIFICALLY SET FORTH ABOVE, REAL TIME AUTOMATION, INC. DISCLAIMS ALL OTHER WARRANTIES,
BOTH EXPRESSED AND IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR APPLICATION. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS. YOU MAY
ALSO HAVE OTHER RIGHTS, WHICH VARY FROM STATE TO STATE.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular application, Real Time Automation, Inc. cannot assume responsibility or liability for actual
use based on the examples and diagrams. Except as specifically set forth above, Real Time Automation and its distributors and
dealers will in no event be liable for any damages whatsoever, either direct or indirect, including but not limited to loss of business
profits, income, or use of data. Some states do not allow exclusion or limitation of incidental or consequential damages; therefore, the
limitations set forth in this agreement may not apply to you.
No patent liability is assumed by Real Time Automation with respect to use of information, circuits, equipment, or software described
in this manual.
Government End-Users
If this software is acquired by or on behalf of a unit or agency of the United States Government, this provision applies: The software
(a) was developed at private expense, is existing computer software, and was not developed with government funds; (b) is a trade
secret of Real Time Automation, Inc. for all purposes of the Freedom of Information Act; (c) is “restricted computer software” submitted
with restricted rights in accordance with subparagraphs (a) through (d) of the Commercial “Computer Software-Restricted Rights”
clause at 52.227-19 and its successors; (d) in all respects is proprietary data belonging solely to Real Time Automation, Inc.; (e) is
unpublished and all rights are reserved under copyright laws of the United States. For units of the Department of Defense (DoD), this
software is licensed only with “Restricted Rights”: as that term is defined in the DoD Supplement of the Federal Acquisition Regulation
52.227-7013 (c) (1) (ii), rights in Technical Data and Computer Software and its successors, and: Use, duplication, or disclosures is
subject to restrictions as set forth in subdivision (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at 52.227-
7013. If this software was acquired under GSA schedule, the U.S. Government has agreed to refrain from changing or removing any
insignia or lettering from the Software or documentation that is provided or from producing copies of the manual or media. Real Time
Automation, Inc.
© 2021 Real Time Automation, Inc. All rights reserved.

Real Time Automation®
3
1-800-249-1612
Overview.......................................................................................................................................................5
Hardware ......................................................................................................................................................6
Powering the Gateway..............................................................................................................................6
Mounting with a DIN Rail..............................................................................................................................7
Accessing the Gateways Configuration Pages ..............................................................................................8
Error: Main Page Does Not Launch...........................................................................................................9
Committing Changes to the Settings ..........................................................................................................10
Main Page ...................................................................................................................................................11
Device Configuration...................................................................................................................................12
PLC Configuration........................................................................................................................................13
Setting up ASCII to PLC Communication.....................................................................................................15
Define PLC Tag / File................................................................................................................................15
Define ASCII Message Termination.........................................................................................................16
Message Queue.......................................................................................................................................17
Data Conversion......................................................................................................................................17
Setting up PLC to ASCII Communication.....................................................................................................18
Define PLC Tag / File................................................................................................................................18
Add Delimiters to ASCII Message............................................................................................................19
Data Conversion......................................................................................................................................19
Diagnostics and Troubleshooting................................................................................................................20
PLC Status................................................................................................................................................20
Diagnostics and Troubleshooting –ASCII to PLC ........................................................................................21
Diagnostic Counters................................................................................................................................22
Diagnostics and Troubleshooting –PLC to ASCII ........................................................................................23
Diagnostic Counters................................................................................................................................24
Diagnostics and Troubleshooting –LEDs....................................................................................................25
PWR.........................................................................................................................................................25
Comm –I/O Scanner...............................................................................................................................25
Comm –PLC ............................................................................................................................................25
USB 1 & USB 2.........................................................................................................................................26
Diagnostics –Main Page .............................................................................................................................27
PLC Status................................................................................................................................................27
ASCII Status .............................................................................................................................................27
Device Status...........................................................................................................................................28

Real Time Automation®
4
1-800-249-1612
Save/Load the Configuration ......................................................................................................................29
Export Configuration...............................................................................................................................29
Import Configuration ..............................................................................................................................29
Utilities........................................................................................................................................................30
Revision Listing........................................................................................................................................30
Diagnostics Logging.................................................................................................................................30
Security Configuration ............................................................................................................................30
Security - Log In.......................................................................................................................................31
Upgrade Firmware ..................................................................................................................................32
Reset Gateway ........................................................................................................................................32
Save and Replace Configuration using SD Card..........................................................................................33
Data Transfer To/From SD Card..............................................................................................................33
Using IP Setup with SD Card....................................................................................................................33
Appendix A: Error Definitions .....................................................................................................................34
Appendix B: I/O Messaging - Configuration (Rev 7.03 or Later).................................................................38
Input / Output Assembly Byte Breakdown .............................................................................................38
Input / Output Assembly Handshaking Breakdown................................................................................39
ASCII to PLC.........................................................................................................................................39
PLC to ASCII .........................................................................................................................................39
Input / Output Assembly Diagnostics Breakdown..................................................................................39
Appendix C: Create User Defined Tag in RSLogix 5000...............................................................................40
Appendix D: How to Access Program Scope Tags in RSLogix 5000.............................................................41
Appendix E: Importing UDT_435USB_Diagnostics.L5X...............................................................................42

Real Time Automation®
5
1-800-249-1612
Overview
The 435USB gateway seamlessly connects an ASCII device to a ControlLogix, CompactLogix, FlexLogix,
MicroLogix, PLC5E, SLC, or other legacy PLC featuring a NetENI module.
Tools and documents available online: http://www.rtautomation.com/product/435-nbx-support/
If at any time you need further assistance do not hesitate to call Real Time Automation support.
Support Hours are Monday-Friday 8am-5pm CST
Toll free: 800-249-1612
Email: [e-mail]

Real Time Automation®
6
1-800-249-1612
Hardware
Powering the Gateway
•The gateway requires an 8-24 VDC power source
Red Wire = (+) Black Wire = (-).
oThe unit draws 175mA @ 12V.

Real Time Automation®
7
1-800-249-1612
Mounting with a DIN Rail
Installing
Follow these steps to install your unit.
1) Mount your DIN Rail.
2) Hook the bottom mounting flange under the DIN Rail.
3) While pressing the 435USB against the rail, press up to engage the spring loaded lower clip
and rotate the unit parallel to the DIN Rail.
4) Release upward pressure.
Removing
Follow these steps to remove your unit.
1) Press up on the unit to engage the spring loaded lower clip.
2) Swing top of the unit away from the DIN rail.
Spring Loaded Lower Clip
DIN Rail

Real Time Automation®
8
1-800-249-1612
Accessing the Gateway’s Configuration Pages
Access the browser based configuration of the 435USB. By default, DHCP is enabled. If the 435USB fails
to obtain an IP address over DHCP it will Auto IP with 169.254.X.Y.
•Connect an 8-24 VDC power source to the gateway, Red Wire = (+) Black Wire = (-).
•Using the supplied crossover cable, connect the gateway to the PC.
•Insert the provided CD-ROM into a computer also on the network. (Refer to the
Accessing_Browser_Configuration doc on the cd to setup DHCP on your PC).
•Run the IPSetup.exe program from the CD-ROM.
•Find unit under “Select a Unit”.
oTo change the IP address to match that of your PC if DHCP has failed, enter the desired
static IP settings on the left hand side and click Set-->.
i. You will know DHCP has failed if the gateway’s IP address is AutoIP at
169.254.X.Y.
ii. If successful it will say DHCP’d at ex: 192.168.0.100 or however your DCHP Client
is setup.
•Click Launch Webpage. The Main Page should appear.
Default setting is set to DHCP. If DHCP fails, default IP address is 169.254.x.y

Real Time Automation®
9
1-800-249-1612
Error: Main Page Does Not Launch
If the Main Page does not launch, please verify the following:
1. Check that the PC is set for a valid IP address
a. Open a MS-DOS Command Prompt
b. Type “ipconfig” and press enter
c. Note the PC’s IP Address, Subnet, and Default Gateway
2. The gateway must be on the same Network/Subnet as the PC whether its set up for DHCP or
Static.
Once you have both devices on the same network, you should be able to ping the gateway using a MS-
DOS Command Prompt.
The screenshot above shows a gateway that is currently set to a static IP address of 192.168.0.100.
If you are able to successfully ping your gateway, open a browser and try to view the main page of the
gateway by entering the IP address of the gateway as the URL.

Real Time Automation®
10
1-800-249-1612
Committing Changes to the Settings
•Any changes made to the IP address or DHCP settings will take effect immediately.
•All other changes made to the settings of the gateway will not take effect until the gateway is
restarted. Changes will not be stored if the gateway’s power is removed prior to a reboot.
•The gateway detects changes and will prompt you with a red notice box to restart the gateway after
change.
•NOTE: The gateway does not need to be restarted after every change. Multiple changes can be
made before a restart, but they will not be committed until the gateway is restarted.
•When all desired changes have been made, press the Reboot button.
•The webpage will redirect to our rebooting page shown below:
•The reboot can take up to 20 seconds. You will know the save was successful if the red box is no
longer present.
oIf the IP address has not been modified, the gateway will automatically redirect to the
main page.
oIf the IP address was modified, a message will appear at the top of the page to instruct
the user to manually open a new webpage at that new IP.
FUN FACT:
The load screen pays homage to the RCA Television test pattern used from 1939-1970. The Native
American head was used to check brightness and contrast, the corner circles check beam focus on
the edges of the screen, the bars for low frequency response and the large circle to test height.

Real Time Automation®
11
1-800-249-1612
Main Page
The main page is where important information about your gateway and its connections are displayed.
Navigation (green box below):
You can easily navigate between pages (Main, Configuration, Diagnostics, and Other pages)
using the buttons on the left hand side.
Device Status (orange box below):
This quickly shows the high-level status of any ASCII Ports that are enabled in the Serial
Configuration. The values on this page mimic the same values that are displayed on the
Diagnostics Page.

Real Time Automation®
12
1-800-249-1612
Device Configuration
1) From the main page, click the Edit button which is located next to Device Configuration.
2) This allows you to edit the Device Description, IP Settings, IP Address, Subnet, Default Gateway
and Ethernet Link settings.
3) To save all values, click the Save Parameters button.
NOTE: Once Save Parameters is pressed, new IP Settings take effect immediately.

Real Time Automation®
13
1-800-249-1612
PLC Configuration
1) Click the PLC Configuration button under the CONFIGURATION section.
2) PLC Type: Select which PLC you are using.
a. If using a Logix PLC, all processors are compatible.
b. If using a PLC5E, then it must be: Series C, Revision N.1 or later; Series D, Revision E.1 or
later; or Series E, Revision D.1 or later.
c. If using a SLC5/05, then it must be: Series A, Version OS501; or FRN5 Series B and Series
C or later.
d. If using a NetENI module, select based on the Processor it is connected to.
e. If connecting to an I/O Scanner, please see User Guide, Appendix B for more details.
3) IP Address: Enter the IP address of the PLC.
a. If using I/O Scanner, this is the IP address of the PLC.
i. If the IP address is 0.0.0.0, the gateway will accept messages from any device.
4) Controller Slot: Enter the slot that the Controller is located in.
a. If you are using an Integrated Ethernet Card, enter slot 0.
b. For Logix processors, this is NOT the slot of the Ethernet Adapter.
5) Communication Mode: Connected (Class 3 Explicit) messaging relies on reserved resources to
transfer data to/from the PLC. Connected (Class 3 Explicit) messaging is recommended if you
are reading and writing and always want to keep that connection open to the PLC.
Unconnected (UCMM) messaging relies on shared resources to transfer data to the PLC. This
could result in message timeouts if there are a lot of devices fighting for these shared buffers. If
you don’t want the RTA gateway to constantly keep the connection open to the PLC but only
maintain a connection when there is data needed to be transferred, then Unconnected (UCMM)
will work best if you are only writing to the PLC.

Real Time Automation®
14
1-800-249-1612
6) Inter-Message Delay: The Inter-Message Delay is a forced delay for each request the gateway
sends to the PLC.
a. This setting will affect the speed at which a message is delivered and the amount of
traffic the gateway adds to the network.
b. If set to 0, the gateway will communicate as fast as possible to the PLC and generate the
most traffic.
c. In applications with a heavy network, it is recommended that you increase this delay to
limit network traffic.
7) Heartbeat Tag/File: This Tag or File will act as an incremental counter for messages passed
though the gateway.
a. For RSLogix5000 Family: This should be an INT Data Type Tag.
b. For RSLogix500 Family: This should be an N Register.
c. This can be used to monitor if the gateway has stopped communicating with the PLC.
Note: If using the UDT you can use the tag name of your UDT with a .Heartbeat after it.
Example: If UDT Tag = RTA435UDT then your Heartbeat tag would be
RTA435UDT.Heartbeat.
8) Diagnostic UDT Tag/File: Enter a Tag/File that is defined in the PLC.
If using RSlogix 5000, this Tag must use the UDT link provided (right click as save as).
If using RSlogix 500, create a N file with 6 elements.
a. Heartbeat: free running counter to let the PLC know that the 435 / 490 is active.
b. Bit_Map_Status: bit map of the ASCII devices communicating.
i. Value 1 = Port 0 is TX/RX data
ii. Value 2 = Port 1 is TX/RX data
iii. Value 3 = Both ports are TX/RX data.
c. ASCII_Event_Delimiter: number of messages called complete due to delimiters
(combined for both ports).
d. ASCII_Event_Length: number of messages called complete due to max number of
characters received (combined for both ports).
e. ASCII_Event_Timeout: number of messages called complete due to the timer being
reached (combined for both ports).
f. ASCII_Event_Discard: number of messages called complete, but RTA had to discard
them due to the queue being full (combined for both ports).
For step-by-step instruction on how to set up the UDT, please see Appendix E.

Real Time Automation®
15
1-800-249-1612
Setting up ASCII to PLC Communication
Click the ASCII Configuration button under the CONFIGURATION section.
Define PLC Tag / File
1) Data Type: Select the Data Type for the Tag / File Name that you defined in the PLC.
a. If PLC Type configured is I/O Scanner, then this field is not used.
2) Enter the Tag / File name you want the gateway to move the ASCII message to.
a. The Tag / File must be defined in the PLC and must match exactly.
b. Most of the time, the Tag Name is defined within the Controller Scope of the PLC for
Read/Write Access.
i. See Appendix D for instructions on how to configure your gateway for a
Program Scope Tag.
c. If PLC Type configured is I/O Scanner, then this field is not used.

Real Time Automation®
16
1-800-249-1612
Define ASCII Message Termination
1) To define an ASCII message, you must select one or more of the following end cases: Character
Count, Timer, or Delimiters.
a. Character Count: Enter the max number of characters that the device could output.
Example: If your device sends a four digit temperature, set the length to 4.
i. If using an INT Data Type, this is also the dimension size/2 + 1 of the Tag / File.
ii. If using a SINT Data Type, this is also the dimension size + 2 of the Tag / File.
iii. For Controllers using RSLogix 5000, the range for each data type is:
STRING/INT/SINT: 1-4096 characters
STRING–If using more than 82 characters, a User Defined Data Type must
be created within the PLC and used. Refer to Appendix C for instructions.
For Controllers using RSLogix 500, the range for each data type is:
STRING: 1-82 characters
INT: 1-200 characters
SINT: Not Used
b. Timer: Use this option if your device sends data of varying lengths and does not have
end delimiters. This is the amount of time we will wait after the last character of a
message before considering the message complete.
c. Delimiters
i. Start: Select how many Start Delimiters to look for in the ASCII message. Use
this feature if the ASCII message has common starting delimiter(s), (characters
at the beginning of every message).
The value of this first dropdown will either gray out or allow a delimiter
to be selected from the next dropdown.
ii. End: Select how many End Delimiters to look for in the ASCII message. Use this
feature if the ASCII message has common end delimiter(s). <CR><LF> is a
common example.
The value of this first dropdown will either gray out or allow a delimiter
to be selected from the next dropdown.
iii. Remove Delimiters: If using any Start or End Delimiters and you do not want
them to be sent to the PLC, then enable this checkbox.

Real Time Automation®
17
1-800-249-1612
Message Queue
1) Queue Size: Enter the number of complete messages you want the gateway to hold before
discarding.
2) Queue Full Behavior: If the Queue is full, the gateway will discard messages one of the following
ways:
a. Discard New Data: Gateway will discard any new messages.
b. Overwrite Oldest Data: Gateway will overwrite oldest message with new data.
Data Conversion
1) NULL Character Handling: Select how the gateway will handle the NULL Character.
a. None (Default): Does no additional conversion on the data before sending it to the PLC.
b. Remove NULL: Removes all NULL characters from the ASCII Message before sending it to
the PLC.
Ex: ASCII device is sending data “$00This $00is $00a $Test$00$00”, The RTA will remove the NULLS
($00) and only send “This is a Test”to the PLC.

Real Time Automation®
18
1-800-249-1612
Setting up PLC to ASCII Communication
Click the ASCII Configuration button under the CONFIGURATION section.
Define PLC Tag / File
1) Data Type: Select the Data Type for the Tag / File Name that you defined in the PLC.
a. If PLC Type configured is I/O Scanner, then this field is not used.
2) Enter the Tag / File name that you want the gateway to monitor for messages.
a. The Tag / File must be defined in the PLC and must match exactly.
b. Most of the time, the Tag Name is defined within the Controller Scope of the PLC for
Read/Write Access.
i. To configure the gateway for a Program Scope Tag, see Appendix D for
instructions.
c. If PLC Type configured is I/O Scanner, then this field is not used.
3) Character Count: Enter the maximum number of characters that the gateway can send to the
ASCII device.
a. If using an INT Data Type, this is also the dimension size/2 + 1 of the Tag / File.
b. If using a SINT Data Type, this is also the dimension size + 2 of the Tag / File.
c. For Controllers using RSLogix5000, the range for each data type is:
i. STRING/INT/SINT: 1-4096 characters.
ii. STRING–If using more than 82 characters, a User Defined Data Type must be
created within the PLC and used. Refer to Appendix C for instructions.
d. For Controllers using RSLogix500, the range for each data type is:
i. STRING: 1-82 characters
ii. INT: 1-200 characters
iii. SINT: Not Used
If you have a barcode scanner device connected, the PLC to ASCII tab will be grayed out

Real Time Automation®
19
1-800-249-1612
Add Delimiters to ASCII Message
1) Delimiters:Configure the characters to add to the message.
a. Start: Use this feature to add a common starting delimiter(s) to messages being sent to
the ASCII device.
i. The value of this first dropdown will either gray out or allow a delimiter to be
selected from the next dropdown.
ii. Use this feature only if your ASCII device requires such delimiters.
iii. All ASCII messages will receive the starting delimiters selected.
b. End: Use this feature to add a common end delimiter(s) to messages being sent to the
ASCII device.
i. The value of this first dropdown will either gray out or allow a delimiter to be
selected from the next dropdown.
ii. Use this feature only if your ASCII device requires such delimiters.
iii. All ASCII messages will receive the end delimiters selected.
Data Conversion
1) Data Conversion:
a. None (Default): Does no additional conversion on the data before sending it from the
gateway to the ASCII device.
b. Prepend NULL: Adds a NULL character to the beginning of each message that is to be
sent from the gateway to the ASCII device.
EX: Data sent from the PLC “This is a Test”, the ASCII device will receive the data as: shown in
HEX: 00 74 00 68 00 69 00 73 00 20 00 69 00 73 00 20 00 61 00 20 00 74 00 65 00 73 00 74
c. Postpend NULL: Adds a NULL character to the end of each message that is to be sent
from the gateway to the ASCII device.
EX: Data sent from the PLC “This is a Test”, the ASCII device will receive the data as: shown in
HEX: 74 00 68 00 69 00 73 00 20 00 69 00 73 00 20 00 61 00 20 00 74 00 65 00 73 00 74 00

Real Time Automation®
20
1-800-249-1612
Diagnostics and Troubleshooting
From any page, click the Diagnostics button under the DIAGNOSTICS section.
PLC Status
PLC Status: Shows same information that is on the main page diagnostics. See section Diagnostics-Main
Page for further explanations.
Connection Attempts: This value increments every time the 435USB loses connection to the PLC and
attempts to reconnect.
Write Heartbeat to PLC:
OK: Number of successful write messages to heartbeat Tag/File Name.
Error: Number of failed write messages to heartbeat Tag/File Name.
Last Error: Specific error information pertaining to the last failed heartbeat message to the PLC.
Write Diagnostic UDT to PLC:
OK: Number of successful write messages to diagnostic UDT tag.
Error: Number of failed write messages to diagnostic UDT tag.
Last Error: Specific error information pertaining to the last failed write message to diagnostic
UDT tag.
Depending on devices connected, tabs may be grayed out