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Communications interface VRPT/SNDA
RS-232 serial port The ventilator is compatible with Philips monitors. It is compatible with
Cardiopulmonary Corporation’s Bernoulli Ventilator Management System. For
complete compatibility information, contact your Philips representative.
Pinout of connector
The RS-232 connection is a 3-wire configuration consisting of a ground and
wires for transmitting and receiving data. Figure 1 shows the pinout of the 25-
pin D-sub connector used for the RS-232 serial port.
Commands and transmission conventions
After receiving a command, followed by a carriage return, the ventilator
responds by transmitting the information in the tables. The fields that
comprise these tables are separated by commas. The ventilator stores and
responds to valid commands in the order received. It returns invalid commands
in an error message.
In the tables shown, a space is designated as "◆". When a field is unused, the
output field contains all spaces.
Pin Signal I/O Description
1 HIS_RS232_SHLD Power HIS RS232 cable shield
2 HIS_RS232_TxD Output HIS RS232 transmit
data output
3 HIS_RS232_RxD Input HIS RS232 receive data
input
7 HIS_SIG_RTN Power HIS RS232/Signal
common
Figure 1: RS-232 serial connector pinout
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