Connecting To The Data Port; Table 18: Data Port Pin Outs - Nellcor OXIMAX N-595 Service Manual

Connecting to
the Data Port
N-595
The RS-232 hardwire interface cable has a DB-15 connector for the
N-595 and the applicable connector for the Datex monitor. Nellcor cable part
number 902255 is recommended for this interface.
Corrupt data will be indicated by a Communications Error displayed on the
Datex monitor.
When the N-595 is in the Datex mode of operation the interface baud rate is
automatically set to 2,400 bits per second.
WARNING: Do not silence the N-595 audible alarm or decrease its
volume if patient safety could be compromised.
The Datex-Ohmeda monitor does not indicate audible or visual alarms for
equipment interfaced. The N-595 monitor must be able to sound an audible
alarm in order to maintain patient safety.
Note: The parameters setup for the Datex-Ohmeda bedside monitor
interface may be saved as institutional default settings. See Setting
Industrial Defaults (Sample) page 40. Use care when performing this
procedure because all settings will be saved as institutional default
settings.
Data is transmitted in the RS-232 format (pins 2, 3, and 5) or RS-422 (pins 1,
4, 9, and 12). RS-232 data can be transmitted a maximum of 25 feet, RS-422
data up to 4000 feet. The pin outs for the data port are illustrated in Figure 20
on page 98.

Table 18: Data Port Pin Outs

Pin
1 RXD+ (RS-422 positive input)
2 RXD_232 (RS-232 input)
3 TXD_232 (RS-232 output)
4 TXD+ (RS-422 positive output)
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)
Data Port Interface Protocol
Signal
97