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. Instrument Overview & Interfacing Architecture
The Sysmex KX-21N / KX-21 is a high-performance hematology instrument designed for diagnostic laboratories and hospital health networks. Integrating this analyzer directly with AILS Cloud LIMS eliminates manual transcription delays, prevents typographical patient identification errors, and automatically enforces Westgard delta check algorithms.
AILS automatically generates worklist queries (QRY^Q02 / ASTM orders) mapped to patient accession barcodes and pushes test instructions directly to the instrument sample tray.
Raw OBX / Result records are parsed instantly within 200 milliseconds, flagged for abnormal reference ranges, and linked to pathologist digital signature queues.
2. Hardware Connection & Communication Settings
3. Sample Message Wire Frame
Below is a real-world 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. Parameter & LOINC Standard Code Mapping
| 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. Biomedical Engineering Tips & Common 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 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.
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.