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WCM802/900
Pin Signals
Figure 1.1. WCM802 / WCM900 OEM RF Module Pin Numbers (bottom view, pins protruding)
Table 1.2. J1 Pin Signal Descriptions
*
**
***
Note: When integrating the WCM802 / WCM900 Module with a Host PC Board, all lines that are not
used should be left disconnected (floating).
Table 1.3. J2 Pin Signal Descriptions
J2 Pins are used primarily for mechanical stability and may be left disconnected.
(Low‐asserted signals distinguished with a horizontal line over signal name.)
Module
Signal Name
Pin
DO2 /
/
1
RS-485 Enable
2
DI3 / SLEEP
3
DO (data out)
4
DI (data in)
5
DI2 /
/ CMD
6
7
DO3 / RX LED
8
/ PWR
9
10
VCC
11
GND
Module has 10K Ω internal pull‐up resistor
Module has 10K Ω internal pull‐down resistor
Module has 100K Ω internal pull‐up resistor
Module
Signal Name
Pin
1
reserved
2
GND
3
GND
4
GND
20 JUN 2005
I/O
When Active
UART host is permitted to send serial data to the module.
Refer to the Serial Communications [p9] and CS Command
O*
low
[p19] sections for more information.
RS-485 Enable – To configure this pin to enable RS-485 (2-
wire or 4-wire) communications, refer to the Serial
Communications [p9] and CS Command [p19] sections.
By default, DI3 pin is not used. To configure this pin to
I*
high
support Sleep Modes, refer to the Sleep Mode [p13], SM
Command [p27] and PW Command [p24] sections.
Serial data exiting the module (to the UART host). Refer to
O*
n/a
the Serial Communications [p9] section for more information.
Serial data entering the module (from UART host). Refer to
I
n/a
the Serial Communications [p9] section for more information.
used. To configure this pin to regulate the flow of serial data
exiting the module, refer to the Serial Communications [p9]
I**
low
and RT Command [p26] sections.
CMD –Refer to Binary Commands [p15] and RT Command
[p26] sections to enable binary command programming.
I*
low
Pin is driven high during RF data reception; otherwise, the
O
high
pin is driven low. Refer to the CD Command [p19] to enable.
low
O
PWR – Indicates power is on and module is not in Sleep
high
Mode.
Pin can be used as a backup method for entering Command
I***
low
Mode during power-up. Primary method is with "+++". Refer
to the Command Mode [p14] section for more information.
I
-
5 VDC regulated (± 0.25)
-
-
Function
(clear-to-send) flow control – When pin is driven low,
(request-to-send) flow control – By default, this pin is not
Re-boot module.
- Pin pulses low during RF transmission.
Ground
PAGE 9
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