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Communications
Communications
Real-Time Serial Output
The 9847 provides real-time data output capability via the pulse oximeter sensor connector (a 9-pin
Sub-D connector). The sensor connector pin assignments are listed below.
Real-time data can also be transmitted to another device through the serial data infrared link (Sensor
Connector) at the top of the device. Refer to Figure 2 on page 7 for the location of the Sensor Connector.
The information from the device in the real-time mode is sent in an ASCII serial format at 9600 baud with
9 data bits, 1 start bit, and 1 stop bit. The data are output at a rate of once per second.
NOTE: The 9th data bit is used for parity in memory playback mode. In real-time mode, it is
always set to the mark condition. Therefore the real-time data may be read as 8 data bits, no
parity.
Real-time data may be printed or displayed by compatible devices. On power up a header is sent
identifying the format and the time and date. Thereafter, the data are sent once per second by the device
in the following format:
HH:MM:SS SPO2=XXX HR=YYY
NOTE: Marked events will display as an asterisk (*) at the end of the line.
where "HH" represents the hour the real-time clock is set to, "MM" represents the minutes, "SS"
represents the seconds, "XXX" represents the SpO
SpO
and pulse rate will be displayed as "---" if there are no data available for the data reading.
2
If a breath was detected in the previous interval a "B" will be appended to the data line and will be printed
by some devices.
Pin Number
Assignment
1
Sensor Detect
2
IR Drive
3
Red Drive
4
Serial Data Output
5
Signal
6
Sensor Type
7
Ground
8
NC
9
Sensor Bias
value, and "YYY" represents the pulse rate. The
2
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