Psion PowerScan M8300 series Bedienungsanleitung Seite 151

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REFERENCES
139
5.1.2 ACK/NACK Protocol
PowerScan
D8330 Readers
This parameter sets a transmission protocol in which the Host responds to the reader
after every code transmitted. The Host sends an ACK character (06 HEX) in the case
of good reception or the NACK character (15 HEX) requesting re-transmission, in the
case of bad reception.
PowerScan
®
D8330 Host
ACK or NACK
data
cable
ACK/NACK enabled
If the reader does not receive an ACK or NACK, transmission is ended after the
RX Timeout (see section 5.1.4).
When ACK/NACK protocol is enabled, FIFO must be disabled manually, see section
5.1.3.
PowerScan
M8300 Readers
The transmission protocol takes place between reader, cradle and Host. The reader
passes its data (code read) to the cradle, which sends it to the Host. The management
of responses (from Host or cradle) depends on the Transmission Mode parameter,
see section 5.9.4.
In the following descriptions the completed transmission is indicated by the Beeper
Control for Radio Response parameter with its default setting to Normal, see section
5.9.5.
When ACK/NACK is disabled (in One-Way tx mode), there is no control from cradle to
Host transmission, the reader responds with the good reception tone.
BC-8 0X0
Host
data
cable
PowerScan™
M8300
data
Transmission Mode = One-Way
good RX
beep
ACK/NACK disabled
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