Cable Connections; Nurse Call - Philips M3921A Service Manual

Cable Connections

Cable Connections

Nurse Call

114
The 9-pin connector mounted on the rear panel provides an access port for a
serial (RS-232) interface to a suitably configured personal computer. Or,
alternatively, qualified service personnel can use the connector to send a
Nurse Call signal.
Pin # Signal
1 not used
2 Rx data
3 Tx data
4 DTR
5 Signal Ground
6 DSR
7 RTS
8 CTS
9 Alarm Out
Pin 9 of the RS-232 serial interface connector provides an
signal. Any time there is any alarm condition active in the monitor, pin 9 goes
to plus RS-232 level voltage (> +5 VDC), if
ON
to in the Set-up Menu. Any time there is no active alarm condition, pin 9
is at minus RS-232 level voltage (< –5 VDC).
The
ALARM SILENCE
Call Signal. All alarm conditions must cease before the signal level
returns to minus RS-232 level voltage (–5 VDC).
Nurse Call Signal
If in the Set-up Menu
always be 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.
Nurse Call Signal
button does NOT deactivate the
Direction
input
output
output
input/output
input
output
input
output
Alarm Out
is set
Nurse
OFF
is set to , pin 9 is
Chapter 9 - RS-232 Interface