User Manual

WipLL System Description
8-14 of 8-16 Issue 03
Draft 02
1QDF10134AAP-SYD-FCC
12) Abnormal condition detection (AC, DC, battery, over-temperature etc.)
8.6.3. Host Communication
The detailed protocol of communication is described in section 8.7 Communication
Protocol &
Data, page 8-14.
The RS232 plug, located at the front panel is used for the connection with the host.
pin assignment for the DB9 connector is as follows:
15
69
RxTxCOM
RS232
Figure 8-11: DB9 Connector
8.7. Communication Protocol & Data
1) The host and the controller communicate in Half-Duplex RS232 9600.N.1 RX,
TX, COM lines, no flow control (neither h/w nor s/w).
2) The HOST is always the MASTER, and the controller is always a slave.
3) Data is binary with no dedicated control chars.
4) Data transmitted by each end has a constant length.
5) There are 3 elements for data reliability: 3 bytes - header.
6) 1 byte - checksum.
7) 3 bytes - termination.
8) Upon reception of a valid packet, the controller will respond in 50mSec as of the
end of the received packet.