A&D FX-3000i RS-232, USB, Ethernet, Statistics & Underhook Guide
- pete8781
- Jul 31
- 5 min read
Need more details or help choosing the correct item? Call MNM Scales at (832) 290-3120 or email mnmscales@yahoo.com.
The A&D FX-3000i RS-232 and connectivity functions make this 3200 g × 0.01 g balance useful as part of a measurement system rather than only as a stand-alone display. RS-232C is standard; Quick USB, Ethernet and an internal rechargeable battery are optional; statistics, ACAI counting, comparator output and underhook weighing expand the types of workflows the balance can support. The key is to design the data path before buying accessories so the balance, software, power arrangement and process all fit together.
Standard RS-232C: the most flexible base interface
FX-3000i includes RS-232C as standard. That gives laboratories and manufacturers a direct path to compatible printers, PCs, serial loggers, data-acquisition software and some PLC/gateway systems without buying an internal interface option. Define the balance and host settings together: baud rate, parity, data bits, stop bits, termination and output mode must match. Also decide when a result should transmit—continuously, after stability, when PRINT is pressed or in response to a host command. A technically correct cable cannot fix a protocol mismatch.
Quick USB: simple PC data capture
The FXi-02 Quick USB option is useful when the balance sits next to one computer and the goal is straightforward data transfer without maintaining a native serial port. This can work well for spreadsheet entry, routine QC results and bench records. Before choosing it, confirm what the receiving software expects: one-way keyboard-like/data transfer and full bidirectional balance control are different requirements. If command control is important, standard RS-232C may remain the better interface even on a modern PC via the appropriate supported adapter.
Ethernet: networked workstations and centralized records
FXi-08 adds Ethernet for stations that need to report over a network rather than directly to a nearby computer. Networked weighing can simplify centralized collection across multiple benches, but it also introduces IT requirements: IP addressing, permitted ports, device naming, receiving software, cybersecurity rules and a plan for network outages. If a measurement is critical, define whether the operator may continue weighing when the network is unavailable and how those results will be reconciled later.
Internal battery versus USB/Ethernet: the option conflict
A&D states that FXi-02 Quick USB, FXi-08 Ethernet and FXi-09 internal rechargeable battery cannot be used at the same time. This is one of the most important buyer-planning details in the FX-i series. A mobile cart may favor the internal battery and standard RS-232C or an external wireless strategy. A fixed network station may favor Ethernet and normal AC power. A nearby desktop may favor Quick USB. Decide which problem the option is solving before the balance is ordered.
Bluetooth and external wireless options
A&D offers Bluetooth-related accessories in the broader FX/FZ ecosystem, including GXA-27 for supported regions/configurations. Wireless certification and availability can vary by country. Treat Bluetooth as a communication accessory, not as a replacement for a data-integrity plan. Define how a lost connection is detected, whether timestamps/identifiers are retained, and how the operator knows a transmitted weight was actually received. For regulated or audited work, the receiving system and SOP matter as much as the radio link.
Statistical Calculation Function for QC
A&D's Statistical Calculation Function can calculate summary information from repeated measurements, supporting quick process checks at the balance. Depending on the configured output, statistics can include count, sum, minimum, maximum, range, mean, standard deviation and coefficient of variation. These summaries are useful for a sampling station, but do not discard individual measurements when traceability or root-cause analysis requires raw data. A mean can appear acceptable even when one package is outside specification.
ACAI counting and the legal-for-trade restriction
ACAI improves average unit mass as more pieces are added, which helps counting accuracy for uniform small parts. MNM lists a 0.01 g minimum unit mass and sample sizes of 5, 10, 25, 50 or 100. The NTEP Class II certificate 08-045A2 explicitly states that the counting feature is not legal for trade. That restriction matters even on a certified/sealed FX-3000iN-type configuration: a legal-for-trade weighing approval does not automatically make every application function a legal commercial transaction mode.
Underhook weighing: useful but mechanically different
The FX-i family supports underhook weighing below the balance. It can help with density work, awkward items, suspended fixtures or samples that should not sit on the normal pan. The underhook fixture, support bench and suspended hardware become part of the measurement system. Keep the balance rigid, ensure the hanging load cannot touch the bench or floor, minimize pendulum motion and tare the suspension hardware correctly. Drafts may have more effect on a hanging sample than on a compact object centered on the top pan.
GLP/GMP/GCP/ISO-style output: useful, not automatic compliance
FX-i can output identifying/calibration-related information intended to support GLP, GMP, GCP and ISO documentation practices. That feature reduces transcription and recordkeeping work, but it does not make a laboratory compliant by itself. Compliance depends on controlled procedures, calibration/verification, user access, record retention, software validation where applicable and review of the complete measurement process. Treat balance output as one controlled data source within the quality system.
Data integrity checklist
Before production use, verify the displayed unit and decimal position, test known weights through the full data path, confirm stable versus unstable result behavior, identify the balance/station in the receiving record, check timestamp responsibility, document communication settings and simulate a disconnected cable or network outage. The goal is to confirm that the value stored by the computer is the same value the operator thinks was accepted. Interface testing should be repeated after software, firmware, cable or configuration changes.
NTEP nuance: adding an interface does not change the purchased trade configuration
MNM sells the standard FX-3000i page as non-NTEP and directs legal-for-trade buyers to FX-3000iN. CoC 08-045A2 lists both FX-3000i and FX-3000iN and says the N suffix is a marketing identifier with no metrological significance, but a real commercial device must still be the correctly marked, configured and sealed unit placed into service under local rules. Installing RS-232C, USB, Ethernet or another communications option does not turn the ordinary MNM stock configuration into a legal-for-trade installation. If trade use is required, start with the trade-sold configuration and evaluate any connected system under the applicable requirements.
Troubleshooting communications
No RS-232 data: confirm the cable/pinout, port, baud/parity/data settings and output mode. Garbled data: mismatched serial parameters are more likely than a weighing fault. Repeated duplicate records: check continuous-output mode and receiving-software parsing. Ethernet connects but no weights arrive: verify IP/network routing plus application port/protocol. USB appears as the wrong device: check driver/interface mode and host expectations. The local weight display should be verified independently before adjusting calibration; a data-format problem and a weighing problem are separate faults.
Frequently asked questions
Does FX-3000i include RS-232C? Yes. Is USB standard? No, FXi-02 Quick USB is optional. Is Ethernet optional? Yes, FXi-08. Can Quick USB, Ethernet and the internal battery be installed together? No; A&D says FXi-02, FXi-08 and FXi-09 are mutually exclusive. Does it calculate statistics? Yes. Does it support ACAI parts counting? Yes, but the NTEP certificate says counting is not legal for trade. Does it support underhook weighing? Yes. Does adding an interface make the MNM FX-3000i stock SKU legal for trade? No; buy the correct sold/sealed trade configuration when that use is required.
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