Mindray BC-2800, Operator'S Manual

Page: 270 / 286

Appendices
D-4
Programming
If the Handshake is off, BC-2800 will transmit the body of the text without acknowledging the
presence of an external computer.
If the Handshake is on, BC-2800 will communicate with the external computer in following
procedures:
1. BC-2800 sends an ENQ (05 Hex), then waits up to 4 seconds for the external computer
to respond. If the external computer does not respond, then one more ENQ (05 Hex) is
tried. If it fails again, the analyzer aborts the transmission and reports a transmission
error;
2. The external computer must respond by sending an ACK (06 Hex). If any other response
is received, another ENQ (05 Hex) will be sent by the analyzer (maximum two ENQ [05
Hex] will be sent);
3. The analyzer then sends:
Body of text
EOT (04 Hex)
ETX (03 Hex)
4. Disconnection.
BC-2800 sends an ETX (03 Hex), then waits 4 seconds for the external computer to
respond. If no response is received, one more ETX ( 03 Hex) is sent, BC-2800 waits 4
seconds before giving up and gives alarm of communication error.
If the external compute responds ACK, the transmission is done successfully. If the external
computer responds NACK
（
15 Hex
）
, the analyzer repeat the transmission from step 3. If the
received response from the computer is neither ACK
（
06 Hex
）
nor NACK
（
15 Hex
）
, the
analyzer sends ETX ( 03 Hex) again.
D.3.2 Sample Data Format
If handshake is enabled
[ENQ]
If handshake is disabled [STX]
Body of the text start
Text Identifier “A”
Version ##
ID length ###
The number of parameters ###
Number of the parameters
having format descriptions
##