9XTend™OEMRFModule–ProductManualv1.2.4
©2005MaxStream,Inc.Confidential&Proprietary6
1.3. Pin Signals
Figure1.1. XTendOEMRFModulePinNumbers
Table1.3. PinSignalDescriptions
(Low‐assertedsignalsdistinguishedwithahorizontallineoversignalname.)
Pin
Number Mnemonic I/O High Impedance
during Shutdown Must
Connect Function
1 GND - - yes Ground
2 VCC I - yes Power: 2.8 – 5.5 VDC
General Purpose Output 2: <Default (CD=2)> Pin is driven low. Refer to the
CD Command [p21] for other configuration options.
3 GPO2 /
RX LED O yes -
RX LED: Pin is driven high during RF data reception; otherwise, the pin is
driven low. Refer to the CD Command [p21] to enable.
4 _PWR O yes - Transmit_Power: Pin pulses low during RF transmission; otherwise, the pin
is driven high to indicate power is on and the module is not in Sleep or
Shutdown Mode.
5 DI I yes yes
Data In: Serial data entering the module (from the UART host). Refer to the
Serial Communications [p9] section for more information.
6 DO O yes -
Data Out: Serial Data exiting the module (to the UART host). Refer to the
Serial Communications [p9] section for more information.
7 I no yes
Shutdown: Pin is driven high during operation and low during Shutdown.
Shutdown enables the lowest power mode (< 1 µA) available to the module.
Refer to the Shutdown Mode [p13] section for more information.
General Purpose Input 2: reserved for future use
8 GPI2 / SLEEP I yes - SLEEP: By default, SLEEP is not used. To configure this pin to enable Sleep
Modes, refer to the Sleep Mode [p14], SM Command [p32] & PW Command
[p28] sections.
General Purpose Output 1: reserved for future use
(Clear-to-Send): <Default (CS=0)> When pin is driven low, the UART
host is permitted to send serial data to the module. Refer to the Serial
Communications [p9] & CS Command [p21] sections for more information.
9 GPO1 / /
RS-485 TX EN O yes -
RS-485 Transmit Enable: To configure this pin to enable RS-485 half and
full duplex communications. Refer to the Serial Communications [p9] & CS
Command [p21] sections.
General Purpose Input 1: reserved for future use
(Request-to-Send): By default, is notused. To configure this pin to
regulate the flow of serial data exiting the module, refer to the Serial
Communications [p9] & RT Command [p31] sections.
10 GPI1 / /
CMD I yes -
CMD (Command): By default, CMD is not used. To configure this pin to
enable binary command programming, refer to the Binary Commands [p16]
& RT Command [p31] sections.
I* no -
Configuration:Pin can be used as a backup method for entering Command
Mode during power-up. Refer to the Command Mode [p15] section for more
information.
11 /
RSSI O* no -
Receive Signal Strength Indicator: By default, pin is used as an RSSI
PWM output after at the conclusion of the power-up sequence.Refer to the
RP Command [p30] for more information.
12-20 reserved / do not connect
*Modulehas10KΩinternalpull‐upresistor
Note: When integrating the XTend Module with a Host PC Board, all lines that are not used should be left disconnected (floating).
