The document describes the Meditech MD200 digital SpO2 module, which is a low-power device used to monitor oxygen saturation and pulse rate, particularly useful in sleep research. It features advanced DSP algorithms to reduce motion artifact and improve accuracy in low perfusion conditions, with operational specifications including a temperature range of 0-45°C and humidity of 30-95%. The module communicates via a TTL asynchronous serial port, supporting a pulse rate range of 30-250 bpm and SpO2 levels of 0-100% with specific accuracy metrics.

1.  Advanced DSP algorithm diminishes the influence of motion artifact
 All digital-signal processing improves accuracy of low perfusion
 Small size, easy to be assembled
Meditech.OEM
[MD100 DIGITAL SPO2 ]
Meditech SpO2 Module MD200 is a Low-power oxygen monitor module; the SPO2 Module is used in the sampling inspection or
measurement of the patient's oxygen saturation and pulse rate. As to the average oxygen
saturation, low-power module can send instantaneous blood oxygen saturation.
It is very useful, especially in the sleep research. The SPO2 module is compatible with the entire

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Range and accuracy
Pulse rate: 30 ～ 250 bpm
SpO2: 0 ～ 100%
Weak perfusion 0.1%
Resolution（1SD）
Pulse rate:（30～250BPM）
2bpm Normal
3bpm Motion or low perfusion
SpO2： （70～100%）
2% Normal
3% Motion or low perfusion
Below 70% Not specified
Environmental Requirements
Operating temperature: 0～45 °C
Storage temperature: -20～60 °C
Operating Humidity：30～95%
Storage Humidity：10～100%
Operating Altitude：-500～5000m
Storage Altitude：-500～10000m
Power Specifications
Par. Min. Typ. Max.
5V ＋4.75V ＋5V ＋5.25V
Ripple --- --- 100mVp-p
Current --- 20mA ---
Communication Protocol
MD200 Module communicates with the host via a asynchronous serial port at TTL levels, the data
format is 4800baud, 8 data bits, odd parity, 1stop bit（4800，8-Odd-1）.

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Byte Bit Description Byte Bit Description
0
0 Signal strength 0
3
0 Pulse rate 0
1 Signal strength 1 1 Pulse rate 1
2 Signal strength 2 2 Pulse rate 2
3 Signal strength 3 3 Pulse rate 3
4 1 = Searching too long 4 Pulse rate 4
5 1 = Sensor unplugged 5 Pulse rate 5
6 1 = Pulse beep 6 Pulse rate 6
7 1 (Syn. bit) 7 0 (Syn. bit)
1
0 Plethysmogram 0
4
0 SpO2 0
1 Plethysmogram 1 1 SpO2 1
2 Plethysmogram 2 2 SpO2 2
3 Plethysmogram 3 3 SpO2 3
4 Plethysmogram 4 4 SpO2 4
5 Plethysmogram 5 5 SpO2 5
6 Plethysmogram 6 6 SpO2 6
7 0 (Syn. bit) 7 0 (Syn. bit)
2
0 Bargraph 0
1 Bargraph 1
2 Bargraph 2
3 Bargraph 3
4 1 = Sensor error
5 1 = Searching for pulse
6 Pulse rate 7
7 0 (Syn. bit)

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Connections
P1-Probe connector
P1 Pin Description
1 Probe output
2 3.3V
3 RED+
4 RED-
5 GND
6 PRO-DET
P2-Host connector
P3 Pin Description
1 TX Output
2 NC
3 GND
4 ＋5V
Size
Unit：mm
Sensor
Only digital sensor can be used for this module.