Ohmeda Ohio 2000 IWS Series, Operation And Maintenance Manual

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A-11
6600-0255-000 12/20/00
Appendix
A-11
Note: In the event of power failure, all serial communication will cease until power is restored.
The Nurse Call and the serial data output share the same female, nine pin, d-type
connector (DB9F).
Pin 2: Receive Data (warmer input)
Pin 3: Transmit Data (warmer output)
Pin 5: Gnd (Signal Ground)
Cable requirements
The user interface cable must have capacitance less than 1500 pF. It should be a
shielded cable such as a Belden 9611 with AMP shielding kit 748046-1 and ferrule
747579-8.
Data transmission
The warmer continuously sends data from the time that it is first powered up. Note that
the warmer serial data transmission can be controlled through the serial port. Data
output stops when the warmer receives a <cntrl>S (XOFF) and resumes when it
receives a <cntrl>Q (XON).
Data format
1 start bit, 7 data bits (ASCII), 1 parity bit (odd), 1 stop bit, 1200 baud, full duplex.
Serial data has the format: start text character, “<stx>”; IWS header, “IW”; software
version; data string; checksum characters; carriage return, “<cr>”; line feed, “<lf>”; end
of text character, “<etx>”. Data elements are separated by spaces, “_”. Each String
contains 53 characters:
Sample data:
<stx>IW0500_35.52_XX.XX_P_00085_36.50_00001000_E014_11<cr><lf><etx>
Data for discussion
(
use the following table)
:
<stx>IWxxxx_pt.pt_xx.xx_m_ppppp_pc.pc_alrmleds_code_ck<cr><lf><etx>
<stx>
Start of text character (ASCII 2) or CTRL B; indicates a string of data will follow.
IWxxxx
IW means the data is from the Infant Warmer; xxxx is the software version in the unit,
e.g. 0500 for version 5.00.
pt.pt
This is the patient temperature in degrees centigrade. The patient temperature will
always be sent even if it is outside the normal display range. Temperatures less than or
equal to 1.00°C indicate an open or a disconnected probe. Any temperature greater
than or equal to 50°C is a shorted probe.
xx.xx
Reserved for future use.
m
This is the mode of operation. P means servo control mode. A means manual control mode.
Always check the mode of operation before evaluating the patient control temperatures.
ppppp
Percentage of nominal power defined as % of heater wattage.
pc.pc
In the servo control mode, this is the patient control temperature set with the
M
and
?
switches in degrees centigrade.