XBIB-U Digi International/Maxstream, XBIB-U Datasheet - Page 49

• Manufacturer Part Number: XBIB-U
• Description: BOARD USB ZIGBEE MOD PRO
• Manufacturer: Digi International/Maxstream

Specifications of XBIB-U

• Design Resources: XBIB-U Shematic
• Accessory Type: Interface Board
• For Use With/related Products: XBee and XBee Pro Radios
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XBee/XBee‐PRO™ OEM RF Modules ‐ 802.15.4 ‐ v1.xAx [2007.05.031]
PR (Pull-up Resistor Enable) Command
PT (PWM Output Timeout) Command
RE (Restore Defaults) Command
RN (Random Delay Slots) Command
<Serial Interfacing> The PR command is used to
set and read the bit field that is used to configure
internal the pull-up resistor status for I/O lines.
“1” specifies the pull-up resistor is enabled. “0”
specifies no pull up.
For example: Sending the command “ATPR 6F” will turn bits 0, 1, 2, 3, 5 and 6 ON; and bits 4 & 7
will be turned OFF. (The binary equivalent of “0x6F” is “01101111”. Note that ‘bit 0’ is the last digit
in the bitfield.
<I/O Settings {I/O Line Passing}> The PT com-
mand is used to set/read the output timeout
value for both PWM outputs.
When PWM is set to a non-zero value: Due to I/O
line passing, a time is started which when expired
will set the PWM output to zero. The timer is reset
when a valid I/O packet is received.
<(Special)> The RE command is used to restore
all configurable parameters to their factory
default settings. The RE command does not write
restored values to non-volatile (persistent) memory. Issue the WR (Write) command subsequent
to issuing the RE command to save restored parameter values to non-volatile memory.
<Networking & Security> The RN command is
used to set and read the minimum value of the
back-off exponent in the CSMA-CA algorithm. The
CSMA-CA algorithm was engineered for collision
avoidance (random delays are inserted to prevent
data loss caused by data collisions).
If RN = 0, collision avoidance is disabled during the first iteration of the algorithm (802.15.4 -
macMinBE).
CSMA-CA stands for "Carrier Sense Multiple Access - Collision Avoidance". Unlike CSMA-CD (reacts
to network transmissions after collisions have been detected), CSMA-CA acts to prevent data colli-
sions before they occur. As soon as a module receives a packet that is to be transmitted, it checks
if the channel is clear (no other module is transmitting). If the channel is clear, the packet is sent
over-the-air. If the channel is not clear, the module waits for a randomly selected period of time,
then checks again to see if the channel is clear. After a time, the process ends and the data is lost.
© 2007 MaxStream, Inc.
bit 0 - AD4/DIO4 (pin 11)
bit 1 - AD3/DIO3 (pin 17)
bit 2 - AD2/DIO2 (pin 18)
bit 3 - AD1/DIO1 (pin 19)
bit 4 - AD0/DIO0 (pin 20)
bit 5 - AD6/DIO6 (pin 16)
bit 6 - DI8 (pin 9)
bit 7 - DIN/CONFIG (pin 3)
AT Command: ATRE
AT Command: ATPR
Parameter Range: 0 - 0xFF
Default Parameter Value: 0xFF
(all pull-up resistors are enabled)
Minimum Firmware Version Required: v1.x80
AT Command: ATPT
Parameter Range: 0 - 0xFF [x 100 msec]
Default Parameter Value: 0xFF
Minimum Firmware Version Required: 1.xA0
AT Command: ATRN
Parameter Range: 0 - 3 [exponent]
Default Parameter Value: 0
Chapter 3 ‐ RF Module Configuration
49