Revision C 170 Series Monitor 8-13
2000947-004
Peripheral Devices: RS-232 Connectors
Transmitted Data Format
The format of the information transmitted from the 170 Series Monitor to the
external computer is shown in Figure 8-3.
NOTE: This applies to both 115 Update mode and 115 Transmit/Receive mode.
The definitions of the bytes are as follows:
Monitor Type
This field contains a 1-byte ASCII value indicating the type of monitor sending the
information. The 170 Series Monitor is set to a fixed value of 9 (39H).
Response Type
This 1-byte value indicates the type of information being sent from the 170 Series
Monitor as shown in Table 8-3.
Monitor ID
This 1-byte ASCII value indicates the ID number of the monitor information. The
170 Series Monitor sets this byte to a fixed value of 0 (30H).
Data Field
This field of n-bytes contains the actual data sent from the monitor to the external
computer. The contents of this field for each response is given below:
Event Mark: This data field is empty whenever the monitor’s Mark button is
selected.
Heart Rate: This data field contains two or three ASCII characters representing
the value of the heart rate. A value of 00 (30H, 30H) indicates a penlift
condition. Heart rate data (including penlift data) is transmitted four times per
second.
Uterine Activity: This data field contains two or three ASCII characters
representing the value of uterine activity. A value of 128 (31H, 32H, 38H)
indicates a penlift condition. Uterine activity data (including penlift data) is
transmitted eight times per second.
Modes: This data field contains two ASCII characters indicating the mode.
The first character is the combined mode of both heart rates according to Table
8-4. The second character is the mode for uterine activity as listed in Table 8-5.
Mode data is transmitted at startup, with each mode change, with each request,
and once every minute.
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