GE Corometrics 170 Series Service Manual page 195

Transmitted Data Format
Revision C
Peripheral Devices: RS-232 Connectors
The format of the information transmitted from the 170 Series Monitor to the
external computer is shown in
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
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
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
8-4. The second character is the mode for uterine activity as listed in
Mode data is transmitted at startup, with each mode change, with each request,
and once every minute.
170 Series Monitor
2000947-004
Figure 8-3.
8-3.
button is
Mark
Table
Table 8-5.
8-13