Define the module's role before selecting a part
Start by describing which part of the product controls radio communication. A host board may operate a radio chip through its own driver, pass data to a serial module, or run the application on a programmable module.
Identify that boundary in the enquiry and attach the relevant part of the connection drawing. For maintenance, an intact marking from an identical working unit is particularly useful. For a new design, state the host controller, interface and development environment.
List evaluation hardware separately from modules intended for installation in production units.
Keep the complete designation
E22 or E32 identifies a family, while purchasing requires the complete part number. Compare candidate versions in a small matrix covering interface, operating band, supply, package, antenna connection and firmware.
Use the documentation for the exact product rather than transferring specifications between similarly named devices. If an older drawing lists several alternatives, attach the complete relevant page and identify the installed version with a photograph.
Retain the approved specification and sample marking for repeat orders. State prototype quantities separately from planned production quantities so that the scope remains clear.
Describe the communication path
Start with a diagram showing which instrument produces data, which device requests it and where the result must arrive. Mark the physical interface on every segment. The instrument port, gateway network connection and radio section can impose different requirements on the selected product.
Include the controller, meter or sensor models and an available protocol description. Explain whether messages should pass through unchanged or be processed before forwarding. The enquiry can describe the architecture without exposing private network credentials.
Radio replacement and serial-server integration
A radio replacement request should include both endpoint identities and the previous configuration. For multiple remote units, add the polling arrangement and node count. Keep host-interface requirements separate from radio settings.
For a serial device server, also describe the network and application software. State the number of independent ports, attached instrument settings and whether the current software access method must be preserved. Evaluate the exact operating scenario for the proposed model.
Choose the assembly level
An enclosed computer, a single-board computer and a core board represent different purchasing scopes. An enclosed unit is selected with its mounting, external ports and power connection. A single-board product must fit the host enclosure and peripheral arrangement.
A core board needs an appropriate carrier-board arrangement. State whether the request covers one replacement assembly, a board set or an enclosed cabinet device. Identify the components that will remain in use and attach a drawing or photograph of the existing design.
Document the application environment
Provide the operating-system version, application architecture and required libraries. List peripheral drivers and equipment interfaces. For a graphical application, identify the display, resolution and touch interface.
State whether source code is available and whether rebuilding the program is acceptable. If the existing system image must be retained, make that a selection requirement.
Processor and memory specifications are only part of the assessment; startup, peripheral access and recovery after restart need their own application checks.
Match the equipment band
Begin with the radio-device model and its operating band. State the actual frequency or tuning range, rather than only the wireless technology. The EBYTE catalogue groups antennas by frequency, so a request for a LoRa or modem antenna still needs the device requirements.
For replacement, include the previous antenna and equipment markings. For a new design, provide the module specification. Retain the selected antenna designation together with the cable and adapter list.
Identify both sides of every connection
Photograph the equipment connector closely enough to show the thread and centre contact. Include its documented designation when available. A remote antenna requires connector details at both ends of the cable, with adapters listed separately.
For an embedded assembly, identify the board connector and permitted cable-exit direction. A photograph of the current connection is useful. Preserve the complete cable-assembly description for repeat orders.
Document the input supply
State whether the installation uses an AC source or a DC bus. Provide the nominal voltage and the range required by the project. For an existing device, include the previous converter marking and its connection drawing.
Keep input and output requirements on separate specification lines, particularly when the cabinet contains several voltages. Compare complete model designations against their individual manufacturer entries.
Describe every output load
List connected consumers with the voltage and current required by each. Identify simultaneous startup and any special startup requirement. A multiple-output supply needs a separate load description for each channel. Mark future equipment as planned load.
For an installed system, provide the original power schedule and identify the instruments actually connected. This ties selection to the real equipment configuration.
Identify the measurement task
Describe what the system measures and where the measurement point is located. For temperature and humidity, state the monitored object, required range and mounting arrangement. For another sensing task, identify the variable and whether the application needs a value, state or event.
A replacement enquiry should include the full previous designation and its documentation. If the model is unknown, provide enclosure and terminal photographs with a connection drawing. Keep measurement requirements separate from interface requirements.
Specify analogue and digital interfaces
State which signal the existing controller accepts. An analogue channel needs the input type, range and wiring; digital communication needs interface, protocol and line settings. If both are used, describe the role of each.
KTH2-RI and KTH2-RV illustrate why the suffix matters: their catalogue entries distinguish current and voltage outputs. Preserve the exact designation and provide the receiving-channel description when comparing options.
Prepare a traceable purchasing schedule
For multiple items, use a table with the manufacturer's designation, your internal reference, quantity and purpose. Name photographs and documents so each attachment can be matched to a line. Separate different configurations even when their appearance is similar.
Configuration and supply scope
Availability, price, lead time, contents and required documents are confirmed against the full code and project requirements. Replacement compatibility is checked using the documentation for the specific devices.