AeroComm Corporation PKLR2400-200 User Manual

AC5124-10 Specifications

11/24/03

4.3

4.3 S

ERIAL

IIII

NTERFACE

ODE

03 – API

API Mode is the most complex and detailed mode, where most of the control is given to the Host. This
mode may seem extensive at first glance; however, it follows a specific pattern of commands and
responses similar to an Ethernet protocol. The commands are grouped into two categories, System
Commands and Transceiver Commands. See Section 5, API Command Set

Section 5, API Command Set

Section 5, API Command Set for the full list of

commands and definitions.

4.4

4.4 S

ERIAL

IIII

NTERFACE

ODE

04 – T

RANSPARENT

, F

IXED

ACKET

LLLL

ENGTH

, N

TTTT

IMEOUT

In Transparent Mode 04, packets will be transmitted over the RF interface when the number of data
bytes received over the serial interface is equal to the Fixed Packet Length specified by the OEM at
EEPROM addresses 43h and 44h (43h is the MSB). The maximum packet size is 07FFh or 2KB. This
mode of operation is recommended for applications that meet any of the following conditions:

1) The Host always sends data packets that are the same size.

2) The Host sends variable-sized data packets, all of which are equal to or smaller than the

Fixed Packet Length. A transceiver will wait indefinitely until the Fixed Packet Length size
is reached. Therefore, multiple packets and/or portions of packets will be sent,
depending on the timing and size of the packets. As a result, the receiving transceiver
Host must be able to process the multiple packets and/or portions of packets.

4.5

4.5 S

ERIAL

IIII

NTERFACE

UFFER

The serial interface buffer provides 8 KBytes of memory segmented into four dynamic regions. In API
Mode, only one region is utilized. In all Transparent Modes, a buffer region is used each time a packet
release condition is met. As an example, in Transparent Mode 02, if 500 Bytes are transmitted,
including the specified End Character, 500 Bytes will be stored in the first region and the remaining 7.5
KBytes will be dynamically allocated for the next three packets. It is strongly recommended that CTS
or upper layer protocol with acknowledgements be used by the OEM when operating in any of the
Transparent Modes to prevent lost data. Otherwise, if all four buffers are filled and the Host continues to
send data over the serial interface, the data will be discarded by the transceiver. This condition can be
eliminated by using CTS.

4.6

4.6 A

DDRESSED

& B

ROADCAST

OMMUNICATION

The AC5124 supports both Addressed and Broadcast Modes of communication in all Serial Interface
Modes. As necessary, refer to Section 5, API Command Set

Section 5, API Command Set

Section 5, API Command Set for API command definitions and Section

Section

6, Configuring the AC5124

6, Configuring the AC5124 for EEPROM address definitions.