Sysmex KX-21N / KX-21 Bi-Directional LIS Interfacing Guide
Complete engineering specification, HL7/ASTM protocols, pinouts, and parameter mapping for Sysmex KX-21N / KX-21 on AILS Cloud LIMS.
1. Sysmex KX-21N / KX-21 Interfacing Overview & Diagnostic Workflow
The Sysmex KX-21N / KX-21 is an automated hematology platform engineered for high-precision complete blood counts (CBC) and white blood cell differential analysis. In modern clinical laboratory workflows, interfacing the Sysmex KX-21N / KX-21 directly to AILS Cloud LIMS eliminates manual transcription delays, captures full WBC scattergram channel flags (such as immature granulocytes, atypical lymphocytes, and platelet clumps), and validates patient results against historical delta check baselines in real time.
AILS Gateway parses sample accession barcodes from the Sysmex KX-21N / KX-21 data stream, linking multi-parameter CBC results directly to open patient encounter records without manual intervention.
Raw result segments are evaluated instantly against laboratory reference intervals and Westgard multirule delta check algorithms. Critical alerts (e.g. severe thrombocytopenia or extreme leukocytosis) trigger automatic hold flags for pathologist microscopic smear review.
2. Sysmex KX-21N / KX-21 RS-232 Serial Port & Pinout Configuration
DB9 Female to DB9 Female Null Modem Cable. Pin 2 (RxD) -> Pin 3 (TxD), Pin 3 (TxD) -> Pin 2 (RxD), Pin 5 (GND) -> Pin 5 (GND). Baud: 9600, 8-N-1.
[Instrument DB9] [AILS Gateway PC] Pin 2 (TxD / Data Out) ---------> Pin 2 (RxD / Data In) Pin 3 (RxD / Data In) <--------- Pin 3 (TxD / Data Out) Pin 5 (GND / Signal) <========> Pin 5 (GND / Signal) Pin 7 (RTS) & Pin 8 (CTS) [Loopback or None] Baud: 9600 | Data Bits: 8 | Parity: None | Stop: 1
3. Sysmex KX-21N / KX-21 ASTM E1394 Record Frame
Below is a validated communication frame transmitted between the Sysmex KX-21N / KX-21 and AILS LIS middleware:
[KX-21N_SERIAL_STREAM] DATE: 2026/08/15 TIME: 12:45 SAMPLE NO: ACC2026081506 WBC: 7.6 10^3/uL RBC: 4.82 10^6/uL HGB: 14.8 g/dL HCT: 43.6 % MCV: 90.5 fL MCH: 30.7 pg MCHC: 33.9 g/dL PLT: 238 10^3/uL LYM%: 28.4 % MXD%: 6.2 % NEU%: 65.4 %
4. Sysmex KX-21N / KX-21 Clinical Parameter LOINC & Reference Range Dictionary
| Instrument Code | LOINC Code | Clinical Parameter Name | Standard Units | Default Reference Range |
|---|---|---|---|---|
| WBC | 6690-2 | White Blood Cells | 10*3/uL | 4.0 - 11.0 |
| RBC | 789-8 | Red Blood Cells | 10*6/uL | 4.5 - 5.9 |
| HGB | 718-7 | Hemoglobin | g/dL | 13.5 - 17.5 |
| PLT | 777-3 | Platelet Count | 10*3/uL | 150 - 450 |
5. Sysmex Biomedical Engineering Field Notes & Gotchas
Ensure analyzer rear switch or menu setting for Data Output is set to Host / DP.
Use an FTDI USB-to-RS232 adapter if connecting to a modern PC without native COM ports.
Set COM port latency timer to 1ms in Windows Device Manager for rapid serial response.
Frequently Asked Questions: Sysmex KX-21N / KX-21 LIS Interfacing
Common biomedical engineering questions regarding connection, worklist setup, and data capture with AILS Cloud LIMS.
Q: What cable is required to connect Sysmex KX-21N to a PC?
A standard DB9 Female-to-Female Null Modem Cable with Pins 2 and 3 crossed and Pin 5 grounded.
Q: What are the serial communication parameters for Sysmex KX-21?
Baud Rate: 9600 bps; Data Bits: 8; Parity: None; Stop Bits: 1; Flow Control: None.
Q: How does AILS Gateway detect new test runs from Sysmex KX-21N?
AILS background serial daemon continuously monitors the COM port and triggers parsing upon receiving the carriage return / line feed record terminator.
Q: Can KX-21N work with barcode tube scanners?
Yes. If the manual barcode scanner is connected to the KX-21N, the scanned accession number is included in the serial header string.
Q: Are 3-part differential parameters (LYM%, MXD%, NEU%) mapped automatically?
Yes. All 18 CBC parameters including absolute and percentage differentials are mapped to LOINC codes.
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Connect Your Sysmex KX-21N / KX-21 to AILS in Under 15 Minutes
Our specialized biomedical engineering team provides complete plug-and-play drivers, cable diagrams, and bi-directional test verification for the Sysmex KX-21N / KX-21.