GE Dash 4000 Service Manual

Equipment overview: Theory of operation
2000966-542D Dash 3000/4000/5000 2-41
Defib Sync
The Defib Sync port provides signals needed to perform synchronized
cardioversion with a defibrillator. The Marker Out signal is a pulse with
selectable amplitude and width that coincides with the patient’s ECG R-
wave. The Marker In signal is returned to the patient monitor by the
defibrillator. The Marker In signal causes the patient monitor to insert a
defib marker in the displayed ECG waveform.
This port also provides two analog signals: ECG and invasive pressure.
The patient monitor provides the top displayed ECG signal with
reconstructed pace pulses. You can use this signal to trigger a
defibrillator or intra-aortic balloon pump. BP1 produces the pressure
signal and is intended for triggering an intra-aortic balloon pump.
Peripheral expansion
Asynchronous communication, Ethernet (shared with the Ethernet RJ-
45 port), 9-18 V power, 5 V power, and discrete I/O signals are provided
in the peripheral expansion interface ports. The expansion port pairs
with the AC mains power inlet to supply power to the patient monitor
through a peripheral device.
Wireless LAN
Initialization
Initialization begins on a card insertion function call from card services.
The card insertion function checks the manufacturer and card ID.
Initialization includes:
 Access Configuration Register - Set through card services to the
manufacturer's recommended value.
 The MAC Address is set to the Dash's MAC address to provide
seamless transition from hardwire to wireless and back.
 SSID - Set to stored value. This ID must be the same between a card
and an access point for them to associate.
Reception
The read task waits on a receive interrupt from the card. When
awakened, the packet length is validated and the packet is copied into an
ethernet buffer. A transfer function using byte-sized transfers is used to
ensure the access time to the card is minimized. The packet length and
pointer is returned to the ethernet stream.

GE Dash 4000 Specifications

General

Resolution	640 x 480 pixels
Power Supply	100-240 VAC, 50/60 Hz
ECG	3/5/12-lead
IBP	Up to 4 channels
Battery Backup	Yes
Certifications	CE, UL, CSA
Parameters Monitored	ECG, SpO2, NIBP, IBP, Temperature, Respiration, Cardiac Output
Connectivity	Ethernet, USB, Serial
Display Type	TFT LCD
Recorder	Integrated thermal printer
Battery Type	Lithium-ion
Operating Temperature	0 to 40°C
Storage Temperature	-20 to 60°C
Humidity Range	15% to 95% non-condensing
Display Size	10.4 inches
Cardiac Output	Available