Welch Allyn Vital Signs Monitor - User Manual - Manual (Page 69)

Vital Signs Monitor 63
APPENDIX B: Nurse Call Interface Wiring Diagram
NOTE: See ““Nurse Call” Interface” on page 40 of the Operator’s Manual for complete
information on the Nurse Call interface.
The Welch Allyn Vital Signs Monitor provides a switch closure output between two pins of the serial
connector (pins 7 and 8). The output is “universal” in that it is compatible with a wide variety of dif-
ferent systems with no polarity dependence. The Nurse Call output is ohmically isolated from all cir-
cuitry. The output is rated for 1 Amp at 240 VAC or 30VDC. During an alarm condition the output is
closed, otherwise the output is open. During a power off or power failure condition the output is
open.