10 Instrument setup
Roche Diagnostics
COBAS INTEGRA 400 plus analyzer/Cedex Bio HT Analyzer · Software version 3.6/5.1 · Host Interface Manual · Version 1.24
Instrument setup
197
About the handshake
We recommend using SW-handshake (XON, XOFF). Only
a three wire cable is then necessary.
Nevertheless the HW-handshake conditions must be
fulfilled. The operating system usually treats HW-
handshake conditions with the highest priority.
In this section
Hardware-handshake (197)
Software-handshake (197)
Hardware-handshake
1. The sender sets its RTS line to active.
This signals the receiver to prepare to receive data
from the sender station.
2. If the receiver is ready to receive data it sets its DTR
line to active.
This signals the sender the receiver is ready,
whereupon the sender starts data transmission.
3. As long as the sender's CTS signal is active, it can
transmit data.
4. If the receive buffer in the receive station is full (or
better still, before it is full), the receiver stops the
transmission by setting the DTR line to inactive.
When the receiver is again ready to receive data, it
sets DTR to active again.
Software-handshake
Sender
After receiving an <XOFF> sign, the send procedure is
interrupted until receipt of an <XON> sign.
Receiver
To interrupt a reception, an <XOFF> sign is sent. Further
reception can be obtained by sending a <XON>.
<XON>: CHAR(17/11H), DC1
<XOFF>: CHAR(19/13H), DC3
q
As soon as the COBAS Instrument software is
started, the host interface is ready to receive data. No
initial SW handshake is required.
