Mini-Circuits RC8DAT-8G-95 User manual

AN-49-011 © 2023 Mini-Circuits
Rev. D | ECO-016581 | 25-Jan-2023Page 1
User Guide
Multi-Channel Programmable
Attenuators

AN-49-011 © 2023 Mini-Circuits
Rev. D | ECO-016581 | 25-Jan-2023Page 2
Table of Contents
1 - General Information .....................................................................................................4
1.1. User-Guide Scope.................................................................................................................................................................... 4
1.2. Support Contacts..................................................................................................................................................................... 4
1.3. Warranty & RMA Returns ....................................................................................................................................................... 4
1.4. End of Life................................................................................................................................................................................ 4
1.5. Definitions ............................................................................................................................................................................... 4
2 - About Mini-Circuits Programmable Attenuators...........................................................5
2.1. Introduction ............................................................................................................................................................................ 5
2.2. Key Features............................................................................................................................................................................ 5
2.3. Intended Applications ............................................................................................................................................................. 5
2.4. Model Selection Guide ............................................................................................................................................................ 6
2.5. Environmental Specifications.................................................................................................................................................. 6
2.6. Supported Software Environments......................................................................................................................................... 7
2.7. Conformity .............................................................................................................................................................................. 7
2.8. Accessories and Options ......................................................................................................................................................... 8
2.9. Service and Calibration............................................................................................................................................................ 8
2.10. Safety & Precautions ............................................................................................................................................................. 8
2.11. Functional Block Diagram...................................................................................................................................................... 9
3 - Software Setup ...........................................................................................................10
3.1. System Requirements ........................................................................................................................................................... 10
3.2. Software Downloads & Resources ........................................................................................................................................ 10
3.3. Software Installation ............................................................................................................................................................. 10
4 - Hardware Setup..........................................................................................................12
4.1. USB Control ........................................................................................................................................................................... 12
4.2. Ethernet Control.................................................................................................................................................................... 12
4.3. Daisy-Chain Control............................................................................................................................................................... 13
4.3.1. Setup Instructions ......................................................................................................................................................... 14

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Table of Contents (continued)
5 - Using Mini-Circuits’ GUI .............................................................................................. 15
5.1. Getting Started...................................................................................................................................................................... 15
5.1.1. USB Control ................................................................................................................................................................... 16
5.1.2. Ethernet Control............................................................................................................................................................ 17
5.2. Operating the Attenuator ..................................................................................................................................................... 19
5.2.1. General Functions.......................................................................................................................................................... 20
5.2.2. Manual Mode Functions................................................................................................................................................ 20
5.2.3. Automatic Mode Functions ........................................................................................................................................... 20
5.2.4. Hop Mode Functions ..................................................................................................................................................... 21
5.2.5. Sweep Mode Functions ................................................................................................................................................. 21
5.2.6. Log Attenuation............................................................................................................................................................. 22
5.2.7. Configuration Settings ................................................................................................................................................... 23
5.3. Ethernet Configuration ......................................................................................................................................................... 24
5.3.1. Default IP Configuration ................................................................................................................................................ 24
5.3.2. Default Static / “Link-Local” IP Address......................................................................................................................... 24
5.3.3. Recovery of IP Configuration via USB............................................................................................................................ 24
5.3.4. Default Factory Setting.................................................................................................................................................. 24
5.3.5. Ethernet Settings Screen ............................................................................................................................................... 25
5.3.6. Ethernet Configuration Tool.......................................................................................................................................... 27
5.4. Operation Modes .................................................................................................................................................................. 28
5.4.1. Sweep Mode.................................................................................................................................................................. 28
5.4.2. Hop Mode...................................................................................................................................................................... 28
5.4.3. PC Control Mode ........................................................................................................................................................... 28
5.4.4. High-Speed Mode.......................................................................................................................................................... 28
5.4.5. Attenuator Switching Time............................................................................................................................................ 29
5.5. Daisy-Chain Control with Dynamic Addressing ..................................................................................................................... 30
5.5.1. Master/Slave Connection with USB Control.................................................................................................................. 30
5.5.2. Dynamic Addressing Functions...................................................................................................................................... 31
5.6. Pop-up Alerts......................................................................................................................................................................... 32
5.7. Firmware Update .................................................................................................................................................................. 33
5.7.1. Requirements ................................................................................................................................................................ 33
5.7.2. Process .......................................................................................................................................................................... 33
5.8. Firmware Recovery ............................................................................................................................................................... 35
5.8.1. Recovery Steps (Current Controller) ............................................................................................................................. 35
5.8.2. Recovery Steps (Legacy Controller) ............................................................................................................................... 36
6 - Revision History.......................................................................................................... 37
7 - Contact Information ...................................................................................................38

AN-49-011 © 2023 Mini-Circuits
Rev. D | ECO-016581 | 25-Jan-2023Page 4
1 -General Information
1.1. User-Guide Scope
This user guide provides general introduction, installation instructions and operating information for Mini-Circuits’ USB &
Ethernet multi-channel programmable attenuators: RC4DAT and RC8DAT series.
For information on Mini-Circuits’ single-channel programmable attenuators see:
•https://www.minicircuits.com/app/AN49-005.pdf
1.2. Support Contacts
We are here to support you every step of the way. For technical support and assistance, please contact us at the email address
below or refer to our website for your local support:
•[e-mail]
•https://www.minicircuits.com/contact/worldwide_tech_support.html
1.3. Warranty & RMA Returns
Mini-Circuits provides a limited time warranty with all products. Please contact your account manager or refer to our website for
full details: https://www.minicircuits.com/support/ordering.html
If you have any questions or concerns with your product, please contact us in the first instance through
[e-mail]. Our team will work with you promptly to understand and resolve any issues. As a software-
controlled instrument, it is usually possible to resolve issues remotely without requiring the unit to be returned to the factory.
In the event that a return to the factory is necessary, Mini-Circuits will provide an RMA number and full return instructions.
1.4. End of Life
Please contact [e-mail] to review environmentally friendly end of life disposal options.
1.5. Definitions
Note:
•A note advises on important information you may need to ensure proper operation of the equipment.
•There is no risk to either the equipment or the user.
Caution:
•A caution advises about a condition or procedure which can cause damage to the equipment.
•There is no danger to the user.
Warning:
•A warning alerts to a possible risk to the user and steps to avoid it.
•Do NOT proceed until you are sure you understand the warning.

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2 -About Mini-Circuits Programmable Attenuators
2.1. Introduction
Mini-Circuits has developed a series of multi-channel programmable attenuators, the RC4DAT and RC8DAT series, which can be
controlled via standard USB or Ethernet-TCP/IP (Telnet, HTTP, and SSH protocols). These programmable attenuators can operate
up to 8000 MHz with an attenuation resolution down to 0.05 dB, and attenuation range of up to 120 dB. These models are plug &
play devices which require no drivers for any of the supported interfaces. With the supplied GUI software, or most common lab
test software, you can remotely set any attenuation level in range almost instantly. The attenuators are light, compact and can be
powered from the USB bus or external power supply, increasing system flexibility.
Using their Ethernet control the RC4DAT and RC8DAT models can be controlled from almost any computer, or even a smartphone
with a network connection from anywhere in the world.
Refer to section 2.4 for details of specific models.
2.2. Key Features
•Multiple independent attenuation channels
•Wide attenuation range (model dependent)
•Wide frequency range
•Fine attenuation resolution
•Multiple control options
•USB HID (Human Interface Device) for “plug & play” operation (no driver installation required)
•User-friendly graphical user interface (GUI) for Windows
•API DLL for Windows and direct USB programming support for Linux (see programming manual for details)
For additional details, performance data and graphs, outline drawing, ordering information and environmental specifications,
see our catalog at: https://www.minicircuits.com/WebStore/RF-Programmable-Step-Attenuators.html
2.3. Intended Applications
Mini-Circuits multi-channel programmable attenuators are intended for indoor use in:
•Lab and test equipment setups for both manual and automated measurements.
•Control systems.
•Production test equipment.
The attenuators can be used by anyone familiar with the basics of electronics measurements or electronic control systems.

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2.4. Model Selection Guide
Model name Num. of
Channels
Frequency
range (MHz)
Atten.
range (dB)
Attenuation
resolution (dB)
Max input
power (dBm)
Control protocols
RC8DAT-8G-95
8
1-8000
95
0.25
+28
USB, HTTP, Telnet, SSH
RC4DAT-8G-95
4
1-8000
95
0.25
+28
USB, HTTP, Telnet, SSH*
RC4DAT-8G-120H 4 200-8000 120 0.05 +23
USB, HTTP, Telnet, SSH,
Daisy-chain
RC4DAT-6G-95
4
1-6000
95
0.25
+23
USB, HTTP, Telnet, SSH*
RC4DAT-6G-60
4
1-6000
63
0.25
+23
USB, HTTP, Telnet, SSH*
RC4DAT-6G-30
4
1-6000
30
0.25
+23
USB, HTTP, Telnet, SSH*
For detailed model performance, data and graphs, outline drawing, ordering information and environmental specifications click
on the model part number.
For setup and control instructions for the different control protocols see chapter 4-.
* SSH support is a new addition, refer to table in section 5.8 for the serial number range which supports this feature.
2.5. Environmental Specifications
Mini-Circuits’ programmable attenuators are intended for operation in office, laboratory, or production test environments. Do
not use in any condition which exceeds the published environmental specifications.
Condition
Specification
Operating temperature
0°C to +50°C
Humidity
5% to 85% RH (non-condensing)
Altitude
Up to 2000 m (6560 ft.)
Pollution degree
2 - Normally only non-conductive pollution occurs (per IEC 61010)

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2.6. Supported Software Environments
Mini-Circuits programmable attenuators have been tested in the following operating systems:
•32-bit systems: Windows 7 or later.
•64-bit systems: Windows 7 or later (GUI & API); Linux.
Custom automation programs can be created in most modern programming environments, including Python, C#, LabVIEW,
MatLab and more.
Refer to the programming manual for more information on attenuator programming.
2.7. Conformity
Mini-Circuits’ programmable attenuators conform to the following international standards:
Standard
Meaning
CE
Meets the requirements of the following applicable European directives and carries the CE marking accordingly:
•Low Voltage – Directive 2014/35
•Electromagnetic Compatibility – Directive 2014/30/EU
•Restriction of the Use of certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) –
Directive 2015/863
UKCA
Meets the requirements of the following applicable UK directives and carries the UKCA marking accordingly:
•Electrical Equipment (Safety) Regulations 2016
•Electromagnetic Compatibility Regulations 2016
•The Restriction of the Use of Certain Hazardous Substances in Ele
ctrical and Electronic Equipment
Regulations 2012
FCC
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation.
USB 2.0
The model meets the specifications of the Universal Serial Bus version 2.0 communication standard as described
by USB-IF.
USB HID The model meets the requirements for Universal Serial Bus Human Interface Devices according to USB-IF’s
Device Class Definition for Human Interface Devices firmware revision 1.11.
TCP/IP The model meets the Ethernet communication complies with the specifications of the Transmission Control
Protocol (TCP) and Internet Protocol (IP) as defined in RFC 791 and RFC 793.
HTTP The model supports all requirements for communicating with the Hypertext Transfer Protocol (HTTP) as defined
in RFC 1945
.
Telnet The model supports all requirements for communicating with the Telnet protocol, as defined in RFC 854.
SSH The models which specify SSH control, support the requirements for SSH protocol as defined by RFCs 4250-4253,
4419, 5647, 5656 and 6668.

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2.8. Accessories and Options
The programmable attenuators are supplied with a control cable:
•3.3 ft (1.0 m) USB cable: USB type A (Male) to USB type Mini-B (Male)
•3.3 ft (1.0 m) USB cable: USB type A (Male) to USB type C (Male) (model dependent)
The following optional accessories are available (see models’ datasheet for details):
•Ethernet cable: RJ45 (Male) to RJ45 (Male) Cat 5E cable
•USB extension cable: USB type A (Male) to USB type A (Female)
•Daisy-chain cable: Digital snap fit (Male-Male) cable assembly connectors (depending on model)
•AC/DC power adapter suitable for a wide selection of wall sockets
•Mounting bracket
•The full software package including GUI, API DLL files and programming instructions, can be downloaded from
https://www.minicircuits.com/softwaredownload/patt.html
2.9. Service and Calibration
The programmable attenuators do not require any periodic service or calibration.
The only user-performed service possible for attenuator modules is external cleaning of the case and connectors as needed. Do
not use any detergents or spray cleaning solutions. The case can be cleaned with a soft, slightly dampened cloth and the
connectors with an alcohol solution. Do not allow any liquid ingress into the case or connectors.
2.10. Safety & Precautions
Mini-Circuits’ programmable attenuators contain no user serviceable parts and should not be opened. Discontinue use and
contact Mini-Circuits in the event of visible damage to any parts.
Please observe the following safety precautions at all times when using Mini-Circuits’ attenuator modules:
Caution:
•Do not input to the device signals of greater power than the attenuator is rated for in its datasheet.
•Safe power input degrades below specified frequency range. Do not input signals below the specified frequency
range.
Warning:
•Properly ground all equipment to reduce the risk of accidental electrical shock.

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2.11. Functional Block Diagram
Figure 2.11a: RC4DAT-models’ functional block diagram
Figure 2.11b: RC8DAT-models’ functional block diagram

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3 -Software Setup
3.1. System Requirements
The minimum requirements for the installation of the Mini-Circuits multi-channel programmable attenuator software package
and API on the host PC are:
•Microsoft Windows 7 or later (32- or 64-bit).
•Intel i3 or equivalent (recommended).
When using the supplied power adaptor, a power source of 110-220VAC (with a socket matching one of the two pin plugs provided)
is also needed.
Control method
Required support
USB control
USB HID
Ethernet control
Network connection
3.2. Software Downloads & Resources
The full programmable attenuator software package (including GUI, API and documentation) is available for download from:
•https://www.minicircuits.com/softwaredownload/patt.html
3.3. Software Installation
•Save all work in progress and close any other programs that may be running.
•Download the programmable attenuator software from the Mini-Circuits website.
Extract the downloaded zip file and begin the installation process and double-click the Setup.exe icon.
•If Microsoft Defender SmartScreen provides a warning about an unrecognized app, select More Info and then Run Anyway.
•If prompted by Windows User Account Control, enter user credentials for an account allowing software installation.

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•Click Next to begin the installation.
•Click Yes to accept the license agreement.
•Click Exit on the final window confirming that installation completed successfully.
In the event of any issues with installation, please contact [e-mail] for support.

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4 -Hardware Setup
4.1. USB Control
Connect the attenuator to the computer using the provided USB cable or equivalent one, and then connect the required RF
connections.
Caution:
•The maximum allowed RF input for programmable attenuator models is reduced at low frequencies.
•Exceeding these values may damage the attenuator. Check the individual model datasheet and do not exceed
the specified limits.
4.2. Ethernet Control
•Connect unit to power source via USB cable or the provided power adaptor.
•Connect a standard network cable between the unit’s RJ45 socket and the network port.
•Ensure the network indicators on the unit’s RJ45 socket light up after a few seconds.
•Connect the unit’s input and output RF ports to your system.

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4.3. Daisy-Chain Control
Some models include Mini-Circuits’ novel dynamic addressing daisy-chaining interface which allows multiple modules to be
connected together into a master/slave chain, with independent control of each module through the single USB connection of the
master unit (see section 2.4 for models supporting this function).
The serial master/slave bus allows connecting modules of different types to the same daisy-chain as long as they all support Mini-
Circuits’ dynamic addressing setup. To add a new module, simply connect it to the daisy-chain and refresh the address listing -- no
need to reset any of the existing modules or assign addresses manually.
Modules will have their addresses assigned automatically when the USB connection from the PC to master is established, or when
a refresh address command is issued. The module connected to the computer USB port will be assigned address 0 (master), and
subsequent modules connected through it will get incrementing addresses, starting from 1 to N. All control will be through the
master module (address 0) which is the only one communicating with the PC.
Note:
•It is possible to connect up to 99 units in a single setup as long as power considerations are taken into account. Refer to model
datasheets for number of units tested in series of a given model.
•It is recommended to disable the Ethernet function (see section 5.3.5) of the slave units before connecting them in series to
reduce power consumption.

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4.3.1. Setup Instructions
Digital & DC connections for daisy-chain control can be done in any order so long as addresses are refreshed once all units and
power supplies are connected.
1. Arrange the required modules on the work surface in the order they are to be addressed.
2. Use the serial control cables (CBL-1.5FT-MMD+, CBL-5FT-MMD+, or equivalent) to connect the units together in the daisy-
chain, from Serial CTRL Out of the first unit, to Serial CTRL In of the second, and so forth.
3. Note the DC current draw of each module in the daisy-chain from the published datasheets.
4. Starting from the first module in the daisy-chain, sum the DC current draw of each module to confirm whether the total
exceeds the maximum pass-through current (500 mA), or the maximum available from the USB supply (if lower).
5. If required, connect an additional 5V DC power supply to the USB port of one of the daisy-chained modules, to keep the DC
consumption of the previous group beneath the specified limit.
6. Repeat the check from this module forward and add additional power supplies as necessary.
7. Finally, connect the USB cable from the first module to the control PC and the complete chain will power up and
automatically assign address (from 00 to nn).
8. To add additional units to the daisy chain, just repeat step 6 from the last unit connected to a power supply, then connect
the additional units with serial control cables and click on the address Refresh button in the GUI (located below the
connected units list).
Figure 4.3.1: List of connected units on the daisy-chain section of the GUI (appearing for supporting models only)

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5 -Using Mini-Circuits’ GUI
All attenuator models are supplied with API programming objects (DLL files) to allow easy control by most common lab test
software (see programming manual for details) and with a Windows GUI program to set the attenuation level manually.
5.1. Getting Started
To start the program, use the Start menu or navigate to the location the Mini-Circuits Programmable Attenuator software was
installed in and run the program.
Once running, the user will be required to pick one of the available control modes: RS232, USB, HTTP, Telnet, or SSH control.
Figure 5.1: Startup screen
In addition to the control modes, the user can try the demo mode – pick one of the available models from the drop-down menu
to learn about the GUI and experiment with the model’s operation.
Neither RC4DAT, nor RC8DAT multi-channel programmable attenuators support RS232 control. For RS232 control, see RUDAT
models: https://www.minicircuits.com/softwaredownload/AN-49-005.pdf

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5.1.1. USB Control
Clicking the USB button in the startup screen will start the unit in USB control. In case the program does not detect a unit connected
to the PC via USB, or if there are no connected units, an alert will pop-up. If the alert persists even when a unit is connected then
check the unit’s USB LED indicator or the USB cable’s integrity.
If multiple units are connected to the PC via USB (non- daisy-chain link), the unit selection screen will appear with a list of the
connected models’ serial numbers and model names.
Note:
•The program can handle up to 24 units connected simultaneously.

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5.1.2. Ethernet Control
To use Ethernet control with a supporting unit either enter its IP address on the startup screen (ports for HTTP/Telnet/SSH would
be also required if using non-default ports) or click on the search icon next to it to find all Mini-Circuits attenuators connected to
the network.
Note:
•When connecting to the unit with Ethernet control for the first time you may need to connect using default IP address or
change the factory default Ethernet configuration to match your network configuration. See section 5.3 or the programming
manual for details.
After clicking on the Search icon,the IP search will pop up with a list of attenuators’ IP addresses and their HTTP ports on the left
side of the screen, and full details of each unit on the right. Click the IP address you wish to use and press Select. The search
window will close, and the IP address will be entered in the IP address field of the startup screen automatically.
Figure 5.1.2a: Ethernet IP search window
Note:
•To refresh the list of units found click on the Search…button.
•The search function uses ports UDP 4950 and UDP 4951 for communication. Ensure your firewall allows access to them.

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Once the IP address has been entered, input the password if one has been set (see section 5.3). Proceed to select the
communication protocol you wish to use (HTTP, Telnet, or SSH) and click on the Ethernet button to begin.
Figure 5.1.2b: Startup screen with Ethernet fields filled
Telnet or HTTP text commands can also be used to control the attenuator. This can be achieved in one of the ways below:
•Type the command in the address field of your internet browser.
•Implement a Get/Post HTTP function in your selected application (for HTTP).
•Establish a Telnet connection.
A full list of the possible commands and queries is available in Mini-Circuits Programming handbook, and in a text file on the
downloaded software (see section 3.3), in the Ethernet directory.

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5.2. Operating the Attenuator
Once the control method has been selected, the main screen of the GUI program will appear.
Figure 5.2a: Main screen – Hop mode
Figure 5.2b: Main screen – Sweep mode
10
19
17
16
11
14
13
15
12
20
21
18
22
23
25
26
24
5
4
3
2
1
6
8
7
9

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5.2.1. General Functions
#
Name
Descriptions
1 Log attenuation
When checked creates a log of all attenuation states and settings sent to the unit. See section
5.2.6 for details.
2
Ethernet settings
Opens the Ethernet configuration window. See section 5.3 for details.
3
Firmware
Opens the Firmware information & update window. See section 5.7 for details.
4 Configuration settings
Opens a pop-up window allowing the user to specify attenuator state at power up and set the
step size used in the manual attenuation setting. See section 5.2.7 for details.
5
Connection options
Returns to the startup screen.
6 Model description
Field describing the model, this shows model part number, serial number and connection
details.
5.2.2. Manual Mode Functions
#
Name
Descriptions
7 Controlled channels
Any attenuation setting specified in the manual control field of the channel will affect all
channels selected in the "Controlled Channels" field.
8
Current attenuation
The value each channel of the attenuator is currently set to.
9
Manual attenuation
set
Attenuation value to be set. This can be changed by either typing a value, or by using the
scroll bar and arrows to change the attenuation then clicking Apply.
10 Auto-apply
When this check box is selected every change in attenuation setting will be applied
immediately. When it is not selected, the user must click Apply to execute the changes.
5.2.3. Automatic Mode Functions
#
Name
Descriptions
11 Continuous
When selected, the attenuator will repeat the user defined sweep or hop until the Stop
button is clicked.
12 Duration
When selected the attenuator will repeat the user defined sweep or hop sequence for the
time specified (can be defined in milliseconds, seconds, minutes, or hours).
13 No. of cycles
When selected the attenuator will repeat the user defined sweep or hop sequence for the
number of cycles specified.
14 PC control
Default setting. Sweep and Hop instructions are sent individually to the unit.
See section 5.4.3 for details.
15
High-speed
Enables high-speed Sweep and Hop functions. See section 5.4.4 for details.
16
Start / Stop
Start and Stop the automatic run (Sweep or Hop) at the current settings.
17 Bi-directional
When selected, the attenuator will sweep or hop through the user defined sequence, then
repeat in the reverse direction (sweeping from stop to start or hopping from last to first point
in the hop list).
Note:
•High-speed mode enables minimum dwell times in the order of micro-seconds, as such, the GUI is unable to display the fast
attenuation changes to the user. Choose PC Control mode to view to attenuation during a sweep/hop sequence.