The parts between semicolons (;) have 24 characters or are omitted
in the case of lines marked with * if there is no additional information.
General information on the RS 232 interface
A prerequisite for the data transfer is that the computer system is
ready to receive the data (active “DSR” on the Reflotron Plus instru-
ment).
After being switched on, Reflotron Plus is in principle ready to
transmit data (active “DTR” on computer).
Data transfer can be interrupted by an X-OFF signal (13 hex).
Reflotron Plus immediately stops the data transfer.
The readiness to receive data must be restored by an X-ON signal
(11 hex) or any other signal.
If the computer is not ready to receive data or is not connected, the
message “NO DATA TRANSFER!” is displayed for approx. 2 seconds.
If the transfer is interfered with or the computer sends an NAK sig-
nal (15 hex), Reflotron Plus interrupts the transfer with the message
“DATA TRANSFER ERROR!”.
If the record received cannot be allocated, the computer may send
a DC4 signal (14 hex) to the Reflotron Plus. Reflotron Plus indicates
this by displaying “UNKNOWN IDENTIFICATlON!” for about 2 sec-
onds.
This can be very helpful if, for example, the patient name entered in
the instrument is unknown to the computer system.
1. IBM AT and compatible PCs
Reflotron Plus PC
(DB-25 plug) (DB-9 plug)
TxD 2 2 RxD
RxD 3 3 TxD
DSR 6 4 DTR
GND 7 5 GND
DTR 20 6 DSR
7 RTS
1 DCD
8 CTS
6.12
Data security
Cable configuration
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