Terumo 801763, Operator'S Manual, Page: 297 / 359

Technical Support
11-2
Communication Protocol
Functional Description
The data transfer module of the System 1 collects and sends formatted ASCII
information through an RS-232 port.
Two types of case information are output from the data transfer module: periodic and
event data. Periodic data is sent every 30 seconds. Event data is sent when the
event occurs.
There are 2 types of event data – Safety events and Cardioplegia events. When an
event occurs, a snapshot of the relevant periodic data is taken and is output at the
same time the event is output. In effect, periodic data is sent at least once every 30
seconds and some periodic data is also output with specific events.
The case information is transferred in data records. The data record content is
determined by the configuration of System 1 and is described in detail in the
Data
Record Description section.
Interface Description
Communication Hardware
The data transfer module provides one-way communication from the System 1 to
an external data collection system. The interface on the module is a DTE female
DB-9 connector. Connect to an external data collection system using a shielded, null
modem cable with 9-pin D-type male to female connectors (DB-9). The connection
between these systems should be made before turning on either device.
Any connected device must be battery operated or on its own isolation transformer to
avoid compromising the leakage current of the data transfer module.
Characters are sent at 38,400 baud using 8 data bits, no parity, and 1 stop bit.
Data Record Description
Data Record Framing
Data records are framed, or packaged, and then transferred from the data transfer
module. The primary function of this communication layer is to detect data corruption
between the data transfer module and the receiving system.
There is no provision for requesting a retransmission if a failure is detected. The
receiving system must ignore the transmission in this case. Only one data record is
transmitted in a frame. The frame has the following format:
STX FN RECORD CONTENT ETX C1 C2 CR LF