10.2. Serial Communication Protocol
This document describes protocols 1.0, 1.7, 2.20, 2.23 and 3.0.
Only protocol version 3.0 contains sending Limits for parameters.
10.2.1.General Description
Abacus+ software is able to make serial connection link to a receiver device (computer) by
connecting to the serial port of the instrument. If Serial Communication Speed (Utilities /
Settings / Customize / General Settings) Baud Rate setting is set to a valid value (other than
Abacus+ initiates serial communication, the receiver must respond to this request.
The hardware protocol is: 8 data bit, 1 stop bit, no parity. If the other side is not
responding within 1 second, Abacus+ will repeat the transmission twice, but if still no
response, the other side will be supposed to be not ready to receive data, and thus Abacus+
will not try to communicate any more.
From this state it can wake up by receiving an <ENQ> (ASCII code 5) character from the
other side, and Abacus+ will immediately respond with an <ACK> (ASCII code 6). From this
point Abacus+ will send data if it is ready for transmission.
The communication is based on packages. There are 7 package types:
INIT package: Device identification, software version, current date and time.
DATA package: Sample and patient information, measured parameters, and markers.
RBC package: Sample information, RBC histogram.
WBC package: Sample information, WBC histogram.
PLT package: Sample information, PLT histogram.
XML file with FULL record structure information
FULL record transmission
The communication sequence is always started with an INIT package. If the link is
successful, Abacus+ will send DATA package, and the receiver can request RBC, WBC and
PLT packages at acknowledge.
If serial communication protocol is set to version 3.0, Abacus+ will send XML and FULL
packages.
Special characters used in the communication:
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