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SECTION 10: SERIAL PORT INTERFACE PROTOCOL
10.1 INTRODUCTION
10.2 ENABLING THE SERIAL PORT
10.3 CONNECTING TO THE SERIAL PORT
10-1 Introduction
10-2 Enabling the Serial Port
10-3 Connecting to the Serial Port
10-4 Real-Time Printout
10-5 Trend Data Printout
10-6 Nurse Call
When a printer is connected to the serial port on the back of the NPB-195, a real-
time printout can be obtained. A new line of data is printed every 2 seconds.
Column headings will be printed after every 25 lines or if one of the values in the
column heading changes. Changing an alarm limit, for example, would cause a
new column heading to be printed. Printouts include patient and device data. A
real-time printout cannot be obtained if the unit is operating on battery power.
The real-time printout is discussed in more detail in paragraph 10.4.
Real-Time data is constantly being sent to the serial port of the NPB-195. To
receive a real-time printout, see paragraph 10.3, for instructions to make the
connection.
The baud rate may need to be changed to match the abilities of the attached
equipment. To change the baud rate, press the Setup softkey, then the Comm
softkey. Use the Adjust Up/Down buttons to select a baud rate of 2400, 9600, or
19200.
Data is transmitted in the standard RS-232 format. Only three lines are used:
GND is the ground, TxD represents the Transmit Data Line, and RxD is the
Receive Data Line. No hardware flow control is used. However, XON/XOFF
flow control is supported. Pin-outs for the serial port are listed in the chart
below.
Table 10-1: Serial Port Pin-Outs
2
3
5, 10
11
1, 4, 6-9, 12-15
The pin layouts are illustrated in Figure 10-1. The conductive shell is used as
earth ground. An AMP connector is used to connect to the serial port. Use
AMP connector (AMP p/n 747538-1), ferrule (AMP p/n 1-747579-2), and
compatible pins (AMP p/n 66570-2).
Pin
RxD
TxD
GND
Nurse call
No Connection
Line
10-1
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Troubleshooting
