Nellcor OxiMax N-550, Service Manual

Page: 102 / 138

Data Port Interface Protocol
92
The pin layouts are illustrated in Figure 42. The conductive shell is used as
earth ground. 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). The serial cable must have a braided
shield providing 100% coverage, such as Beldon cable (Beldon P/N 9616) or
equivalent. Connectors at both ends of the serial cable must have the shield
terminated to the full 360 degrees of the connector's metal shell.
CAUTION: Do not create sharp bends in the cable; this may tear or
break the shield.
Figure 42: Data Port Pin Layout
Pins 2, 3, and 5 provide data in RS - 232 format.
Pins 1, 4, 9, and 12 provide data in RS-422 format.
10 Signal Ground
11 Nurse Call (RS-232 level output)
12 TXD- (RS-422 negative output) (-5 to -12 VDC with no audible
alarm, 5 to 12 VDC with audible alarm)
13 NC
14 NC
15 Nurse Call Common for Dry Contacts
Table 13: Data Port Pinouts (Continued)
Pin Signal Name