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Data Port Interface Protocol
114
Pin
Signal
5
Signal Ground (isolated from earth ground)
6
AN_SpO
(analog saturation output)
2
7
Normally Open (N.O.), Dry Contacts, for Nurse Call (N.O. with no audible
alarm)
8
Normally Closed (N.C.), Dry Contacts, for Nurse Call (N.C. with no audible
alarm)
9
RXD- (R-422 negative output)
10
Signal Ground (isolated from earth ground)
11
Nurse Call (RS-232 level output [-5 to -12 VDC with no audible alarm] [+5 to
+12 VDC with audible alarm])
12
TXD- (RS-422 negative output)
13
AN_Pulse (analog pulse rate)
14
AN_Pleth (analog pleth waveform output)
15
Nurse Call Common for Dry Contacts
Note:
When the instrument is turned off, the contact at pin 7 becomes closed
and the contact at pin 8 becomes open.
The pin layout is illustrated in Figure 16 is viewed from the back of the monitor.
An AMP connector is used to connect to the data port. Use AMP connector (AMP
P/N 747538-1), ferrule (AMP P/N 1-747579-2), and compatible pins (AMP P/N
66570-2).
Figure 16: Data Port Pin Layout
When building an RS-422 cable, a resistor (120 ohms, 1/2 watt, 5%) must be
added between pins 1 and 9 of the cable. The end of the cable with the resistor
added must be plugged into the N-595. This resistor is not necessary for RS-232
cables.
The data cable must be shielded (example: Belden P/N 9616). Connectors at both
ends of the data cable must have the shield terminated to the full 360 degrees of
the connector's metal shell. If rough handling or sharp bends in the cable is
anticipated, use a braided shield.
Table 18: Data Port Pin Outs
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