1 About communication
Roche Diagnostics
COBAS INTEGRA 400 plus analyzer/Cedex Bio HT Analyzer · Software version 3.6/5.1 · Host Interface Manual · Version 1.24
About communication 21
Communication control
To maintain safe data communication, the following
communication control mechanisms are used:
In this section
Parity check (21)
Flow control (hardware/software handshake) (22)
Sequence counter and block check sum (22)
Check of block and line composition (23)
Receive timeout (23)
Parity check
This is the most common method used for detecting
errors on asynchronous interfaces. The number of active
data bits in each character is counted prior to
transmission. A parity bit is then added on so that the
total number of binary 1’s in the complete character
frame is either odd or even according to the preselection
in the interface configuration. The receiving device will
then perform the same inspection.
Any mismatch will generate a parity error: Instruments
will transmit an error message (block 99). Host systems
will use the error handling.
u Related topics
• Error handling (24)
Location Controls
RS-232 specific Parity check
Flow control
(hardware/software
handshake)
Instrument and host Sequence counter (SC)
Block check sum (BCS)
Instrument specific Check of block and line
composition
Host specific Time-out control
y Communication control mechanisms
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