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9XTend ‐ PKG ‐ E? ? Ethernet ? RF ? Modem ? – ? Product ? Manual ? v2.x4x ? [2007.01.04]
TX (Transmit) Request: 16-bit address
API Identifier Value: 0x01
A TX Request message will cause the modem to send RF Data as an RF Packet.
Figure ? 4 ‐ 7.
TX ? Packet ? (16 ‐ bit ? address) ? Frames
Start Delimiter
Length
Frame Data
Checksum
0x7E
MSB
LSB
API-specific Structure
1 Byte
API Identifier
0x01
Identifier-specific Data
cmdData
Frame ID (Byte 5)
Identifies the UART data frame for the host to
correlate with a subsequent ACK (acknowledgement).
Setting Frame ID to ‘0' will disable response frame.
Destination Address (Bytes 6-7)
MSB first, LSB last.
Broadcast = 0xFFFF
Options (Byte 8)
0 = Standard
1 = Disable ACK
RF Data (Byte(s) 9-n)
Up to 2048 Bytes per packet
Figure ? 4 ‐ 8.
Example: ? TX ? Packet ? API ? Frames ??
Byte 1
Bytes 2-3
Byte 4
Byte 5
Bytes 6-7
Byte 8
Bytes 9-11
Byte 12
0x7E
0x00
0x08
0x01
R (0x52)
0xFFFF
0x00
1 (0x31) 2 (0x32) 3 (0x33)
0x18
Start Delimiter
Length*
API Identifier
Frame ID**
Destination Address
Option
RF Data
Checksum
* ? Length ? [Bytes] ? = ? API ? Identifier ? + ? Frame ? ID ? + ? Destination ? Address ? + ? Option ? + ? RF ? Data
** ? “R ” ? value ? was ? arbitrarily ? selected
TX (Transmit) Status
API Identifier Value: 0x89
When a TX Request is completed, the modem sends a TX Status message. This message will indi-
cate if the packet was transmitted successfully or if there was a failure.
Figure ? 4 ‐ 9.
TX ? Status ? Frames
Start Delimiter
Length
Frame Data
Checksum
0x7E
MSB
LSB
API-specific Structure
1 Byte
API Identifier
0x89
Frame ID (Byte 5)
Identifier-specific Data
cmdData
Status (Byte 6)
Identifies UART data frame being reported.
Note: If Frame ID = 0 in the TX Request, no
AT Command Response will be given.
0 = Success
1 = No ACK (Acknowledgement) received
NOTE: “STATUS = 1” occurs when all retries are expired and no ACK is received.
“STATUS = 3” occurs when a packet is purged due to a ‘Polled Remote’ not receiving a poll.
RX (Receive) Packet: 16-bit address
API Identifier Value: 0x81
When the modem receives an RF packet, it is sent out the UART using this message type.
Figure ? 4 ‐ 10. RX ? Packet ? (16 ‐ bit ? address) ? Frames
Start Delimiter
Length
Frame Data
Checksum
0x7E
MSB
LSB
API-specific Structure
1 Byte
API Identifier
0x81
Identifier-specific Data
cmdData
Source Address (Bytes 5-6)
MSB (most significant byte) first,
LSB (least significant) last
RSSI (Byte 7)
Received Signal Strength Indicator -
Hexadecimal equivalent of (-dBm) value.
(For example: If RX signal strength = -40
dBm, “0x28” (40 decimal) is returned)
Options (Byte 8)
bit 0 = ACK
bit 1 = Indicate broadcast
bits 2-7 [reserved]
RF Data (Byte(s) 9-n)
Up to 2048 Bytes per
packet
? ? 2007 ? MaxStream, ? Inc., ? Confidential ? & ? Proprietary ?‐? All ? Rights ? Reserved ?
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