AeroComm Corporation AC4490 Benutzerhandbuch
1 3
S E R I A L I N T E R F A C E
www.aerocomm.com
F i g u r e 3 : E v e n P a r i t y B i t
Note: Enabling parity cuts throughput and the interface buffer in half.
O E M H O S T D A T A R A T E
The OEM Host Data Rate is the rate with which the OEM Host and transceiver communicate over the serial interface.
This rate is independent of the RF baud rate, which is fixed at 76.8 kbps. Possible values range from 1200 bps to
115,200 bps. Note: Enabling Parity cuts throughput in half and the Interface Buffer size in half. The following
asynchronous serial data formats are supported:
This rate is independent of the RF baud rate, which is fixed at 76.8 kbps. Possible values range from 1200 bps to
115,200 bps. Note: Enabling Parity cuts throughput in half and the Interface Buffer size in half. The following
asynchronous serial data formats are supported:
S E R I A L I N T E R F A C E B A U D R A T E
This two-byte value determines the baud rate used for communicating over the serial interface to a transceiver. The
Table below lists values for some common baud rates. Baud rates below 1200 baud are not supported. For a baud
rate to be valid, the calculated baud rate must be within ±3% of the OEM Host baud rate. If the Test pin (Pin 12) is
pulled logic Low at reset, the baud rate will be forced to 9,600. The RF baud rate is fixed at 76.8 Kbps and is
independent of the interface baud rate. For Baud Rate values other than those shown below, the following equations
can be used:
Table below lists values for some common baud rates. Baud rates below 1200 baud are not supported. For a baud
rate to be valid, the calculated baud rate must be within ±3% of the OEM Host baud rate. If the Test pin (Pin 12) is
pulled logic Low at reset, the baud rate will be forced to 9,600. The RF baud rate is fixed at 76.8 Kbps and is
independent of the interface baud rate. For Baud Rate values other than those shown below, the following equations
can be used:
T a b l e 6 : S u p p o r t e d S e r i a l F o r m a t s
Data Bits
Parity
Stop Bits
Transceiver Programming Requirements
8
N
1
Parity Disabled
7
N
2
Parity Disabled
7
E, O, M, S
1
Parity Disabled
9
N
1
Parity Enabled
8
N
2
Parity Enabled
8
E, O, M, S
1
Parity Enabled
7
E, O, M, S
2
Parity Enabled
Mark (M) corresponds to 1 & Space (S) corresponds to 0