X24-009PKC-UA Digi International/Maxstream, X24-009PKC-UA Datasheet - Page 26

• Manufacturer Part Number: X24-009PKC-UA
• Description: MODEM RF 2.4GHZ 9600BPS USB
• Manufacturer: Digi International/Maxstream
• Series: XStream™r

Specifications of X24-009PKC-UA

• Function: Transceiver, Modem
• Modulation Or Protocol: FHSS
• Frequency: 2.4GHz ~ 2.4835GHz
• Applications: General Purpose
• Interface: USB
• Sensitivity: -110dBm
• Power - Output: 17dBm (50mW)
• Data Rate - Maximum: 20 kbps
• Voltage - Supply: 5V
• Package / Case: Module
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Features: -

XStream‐PKG‐U™ USB RF Modem – Product Manual v4.2B5 [2006.02.27]
RP (RSSI PWM Timer) Command
RR (Retries) Command
RS (RSSI) Command
<Diagnostics> RP Command is used to enable a
PWM (“Pulse Width Modulation”) output on the
Config pin which is calibrated to show the level
the received RF signal is above the sensitivity
level of the modem. The PWM pulses vary from
zero to 95 percent. Zero percent means the
received RF signal is at or below the published
sensitivity level of the modem. The following
table shows levels above sensitivity and PWM values.
The total period of the PWM output is 8.32 ms. There are 40 steps in the PWM output and
therefore the minimum step size is 0.208 ms.
A non-zero value defines the time that the PWM output will be active with the RSSI value of the
last received RF packet. After the set time when no RF packets are received, the PWM output will
be set low (0 percent PWM) until another RF packet is received. The PWM output will also be set
low at power-up. A parameter value of 0xFF permanently enables the PWM output and it will
always reflect the value of the last received RF packet.
PWM output shares the Config input pin. When the modem is powered, the Config pin will be an
input. During the power-up sequence, the Config pin will be read to determine whether the
modem is going into AT Command Mode. After this, if RP parameter is a non-zero value, the
Config pin will be configured as an output and set low until the first RF packet is received. With a
non-zero RP parameter, the Config pin will be an input for RP ms after power up.
Networking> RR Command specifies the number
of retries that can be sent for a given RF packet.
Once RR Command is enabled (set to a non-zero
value), RF packet acknowledgements and retries
are enabled. After transmitting a packet, the
transmitter will wait to receive an
acknowledgement from a receiver. If the
acknowledgement is not received in the period of time specified by the RN (Delay Slots)
Command, the transmitter will transmit the original packet again. The packet will be transmitted
repeatedly until an acknowledgement is received or until the packet has been sent RR times.
Note: For retries to work correctly, all modems in the system must have retries enabled.
<Diagnostics> RS Command returns the signal
level of the last packet received. This reading is
useful for determining range characteristics of the
XStream Modems under various conditions of
noise and distance.
Once the command is issued, the modem will
return a value between 0x6 and 0x36 where 0x36 represents a very strong signal level and 0x4
indicates a low signal level.
© 2006 MaxStream, Inc. Confidential and Proprietary
dBm above Sensitivity
10
20
30
(high period / total period)
AT Command: ATRP
Binary Command: 0x22 (34 decimal)
Parameter Range: 0 - 0x7F
Default Parameter Value: 0 (disabled)
Number of bytes returned: 1
Minimum Firmware Version Required: 4.2AA
AT Command: ATRR
Binary Command: 0x18 (24 decimal)
Parameter Range: 0 – 0xFF
Default Parameter Value: 0 (disabled)
Number of bytes returned: 1
Minimum Firmware Version Required: 4.22
AT Command: ATRS
Binary Command: 0x1C (28 decimal)
Parameter Range: 0x06 – 0x36 [Read-only]
Number of bytes returned: 1
Minimum Firmware Version Required: 4.22
PWM percentage
47.5
62.5
77.5
[x 100 milliseconds]
26