Serial Comm Connector Pin Assignments - Nellcor N-200 Operator's Manual

Connecting to Other Instruments
Table 4: SERIAL COMM Connector Pin Assignments
Connector
Pin
1
2
3
4
5
6
7
8
9
WARNING: Pin 9 only gives notice of alarm limit
violations. It will not alert a remote system of signal loss
or sensor disconnection. Do not use this Pin to activate
a remote alarm system.
Note: The logic level output of Pin 9 is not intended to
activate a remote alarm system. Its use is intended to
allow remote sensing of alarm limit events only.
Pin 9 output is less than +0.3 V when no alarm limit is violated
and greater than +4.0 V when an alarm limit violation exists.
This pin should be connected to a high-impedance circuit
(greater than 1 megohm) and protected against transient
voltages.
Pin 6 (DSR) must be held high by the connected device if trend
and event data are to be output in ASCII format to that device.
Pin 8 (CTS) may be used to control transmission data. When
held high (positive voltage), data transmission takes place.
When low (negative voltage), data transmission is suspended
temporarily.
62
Signal
not used
Rx data
Tx data
DTR
Signal Ground
DSR
RTS
CTS
Alarm Out
Output
Device
Direction Pin
none none
←
→
→
↔
←
→
20
←
25
→
Output
Device
Signal
none
2 Tx data
3 Rx data
6 DSR
7 Signal Ground
4 RTS
5 CTS
DTR
see warning