Revision B 120 Series Maternal/Fetal Monitor 11-11
2015590-001
Peripheral Devices: Model 115-Compatible Communications Protocols
Transmitted Data Format
The format of the information transmitted from the 120 Series Monitor to the
external computer is shown in Figure 11-3.
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 120 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 120 Series
Monitor as shown in Table 11-1.
Monitor ID
This 1-byte ASCII value indicates the ID number of the monitor information. The
120 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 pushbutton is pressed.
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 11-2. The
second character is the mode for uterine activity as listed in Table 11-3. Mode data is
transmitted at startup, with each mode change, with each request, and once every
minute.
Annotations
This field of n-bytes contains actual ASCII data making up messages sent to the 120
Series Monitor. This information can be: messages sent from a Model 2115/2116B
Data Entry System; or patient parameter information (SpO
2 and/or NBP) from the
monitor’s internal modules or external devices connected to the monitor.
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