26
Write API Control
The OEM Host issues this command to the transceiver
to write the API Control byte.
Command: 0xCC 0x17
Number of bytes returned: 2
Response: 0xCC API Control
Set Max Power
The OEM Host Issues this command to limit the
maximum transmit power emitted by the transceiver.
This can be useful to minimize current consumption
and satisfy certain regulatory requirements. The radios
are shipped at maximum allowable power.
Command: 0xCC 0x25 New_Max_Power
Number of bytes returned: 2
Response: CCh New_Max_Power
Read Temperature
The OEM Host issues this command to read the
onboard temperature sensor. The transceiver reports
the temperature in °C where 0 – 80h corresponds to 0 –
80°C and where D8h – 0h corresponds to -40 – 0°C.
Command: 0xCC 0xA4
Number of bytes returned: 2
Response: 0xCC Temperature
Parameter Range:
Temperature = 0xD8 – 0x80
Read Digital Inputs
The OEM Host issues this command to read the state
of both digital input lines.
Command: 0xCC 0x20
Number of bytes returned: 2
Response: 0xCC Data1
Parameter Range:
Data1 = bit-0 – GI0, bit-1– GI1, bits 2 – 7: 0
Read Radio Table
The OEM Host issues this command to read the Radio
Table that resides on the transceiver. The Radio Table
stores information for up to the last 8 transceivers that
sent it a packet. This information is very useful for
providing alternative data paths.
Command: 0xCC 0x18
Response:
Byte 1 = 0xCC
Byte 2 = # of transceivers in this table (0x00-0x08)
Byte 3 = Mac (2,1,0) of transceiver #1
Byte 4 = RSSI
Byte 5 = RSSI*
Byte 6 = Stale Count of transceiver #1
Byte 7 = Mac (2,1,0) of transceiver #2
Byte 8 = RSSI
Byte 9 = RSSI*
Byte 9…n = Stale Count of transceiver #2…and so on.
Stale Count: The Stale
Count Reload (0x4F)
determines the amount
of time a radio will stay
active in the Radio
Table. The Stale Count
(min: 0x00, max:
depends on the
EEPROM Setting) for a
radio is set to 0 when a
packet is received; it
then gets incremented
by one every 100ms.
When the Stale Count
of a radio reaches the
Stale Count Reload
(0x4F) the radio is
considered Stale. A
Radio Table can hold
up to a maximum of 8
radios’ information;
however if the Radio
Table is full and 9th
radio is received, the
first radio that is Stale
is replaced with the
new radio. If none of
the radios are stale,
the oldest radio in the
table is replaced with
the new radio.
Quick Tip:
Signal
Strength
(dBm)
RSSI Value
(hex)
4 0x0E
-2 to 1
0x0D
-12 to -6
0x0C
-36 to -22
0x0B
-42 to -39
0x0C
-46 0x0D
-49 0x0E
-52 0x11
-56 0x17
-59 0x1C
-62 0x2B
-66 0x40
-69 0x55
-72 0x62
-76 0x71
-79 0x78
-82 0x84
-86 0x9A
-89 0xAD
-92 0xBD
The RSSI is how strong the remote transceiver heard
the local transceiver, RSSI* is how strong the local
transceiver heard the remote transceiver. The table
above can be used to convert the RSSI to the
corresponding signal strength. One dBm is equal to
approximately four steps.
Note: Notice the trend between 4dBm and -12dBm
does not follow the curve. This is because RSSI
electronic components distributor
