Nellcor OXIMAX N-600X Series Service Manual page 80

Managing the Data Port
Caution
Do not create sharp bends in the cable, as this may tear or break the shielding.
No hardware flow control is used. However, support exists for XON/XOFF flow control in ASCII mode.
Data Port Pinouts
WARNING
If the serial port, analog outputs, or nurse call lines are shorted, remote
communication may be lost.
•
RS-232 Format—Pins 2, 3, and 5 provide RS-232 format data. When building an RS-232
cable, do not add a resistor and keep cable length to a maximum of 25 feet.
•
RS-422 Format—Pins 1, 4, 9, and 12 provide RS-422 format data. When building an
RS-422 cable, add a resistor (120 ohms, 1/2 watt, 5%) between pin 1 and pin 9 of the cable
and keep cable length to a maximum of 4,000 feet. Plug the end of the cable with the
resistor added into the oximeter.
•
Differential Data Transmission—Pins 3 and 4 (TxD+ and TxD-) are the differential transmit data pair.
•
Differential Data Reception—Pins 1 and 2 (RxD+ and RxD-) are the differential receive data pair.
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Table 15. Data Port Signal Pinouts
Pin Number
1 RxD+ (RS-422 [+] input)
2 RxD_232 (RS-232 input)
3 TxD_(RS-232 output)
4 TxD+ (RS-422 [+] output)
5 Signal Ground (isolated from Earth Ground)
6 AN_ (analog saturation output)
7 NC_NO (relay closure nurse call, normally open)
8 NC_NC (relay closure nurse call, normally closed)
9 RxD- (RS_422 [-] input)
10 Signal Ground (isolated from Earth Ground)
11 Nurse Call (RS-232-level-output)
12 TxD- (RS-422 [-] output)
13 AN_PULSE (analog pulse rate output)
14 AN_PLETH (analog pleth waveform output)
15 NC_COM (relay closure nurse call, common lead)
10030881 Rev. B 12-2008
Signal Name
Service Manual