Nurse-call, Nurse-call -4 – Philips 862478 User Manual
Page 158
About the RS-232 Interface
10-4
RS-232 Interface
Pin connections for the 9-pin connector are as follows:
Nurse-Call
Pin 9 of the RS-232 serial interface connector provides an Alarm Out signal. Any time there is
any alarm condition active in the monitor, and if the Nurse Call Signal option in the Setup
Menu is On, pin 9 goes to plus RS-232 level voltage (> +5 VDC). The alarm delay shall be
< 0.5 seconds.
If in the Setup Menu, the Nurse Call Signal option is Off, pin 9 is always at the minus
RS-232 level voltage. In order to make use of the Alarm Out signal, pin 9 should be
connected to a high-impedance circuit (>1000) and protected against transient voltages.
Table 10-1. RS-232 Serial Interface Connections
Pin #
Signal
Direction
1
not used
2
Rx data
input
3
Tx data
output
4
DTR
output
5
Signal Ground
input/output
6
DSR
input
7
RTS
output
8
CTS
input
9
Alarm Out
output