WISMC03BI Laird Technologies, WISMC03BI Datasheet - Page 13
![MODULE LAN 802.11B/G BISM](/photos/14/19/141968/wismc03bi_sml.jpg)
WISMC03BI
Manufacturer Part Number
WISMC03BI
Description
MODULE LAN 802.11B/G BISM
Manufacturer
Laird Technologies
Series
EZURiOr
Specifications of WISMC03BI
Frequency
2.4GHz
Data Rate - Maximum
1Mbps
Modulation Or Protocol
802.11 b/g
Applications
AMR, Automotive, ISM
Power - Output
15dBm
Sensitivity
-86dBm
Voltage - Supply
3.3 V ~ 5.5 V
Current - Transmitting
250mA
Data Interface
Connector, 50 Pin, DF-12
Memory Size
64Mbyte Flash, 16MByte SRAM
Antenna Connector
U.FL
Operating Temperature
-40°C ~ 85°C
Package / Case
Module
Wireless Frequency
2.412 GHz to 2.484 GHz
Interface Type
UART
Board Size
22.8 mm x 33.8 mm x 7.6 mm
Modulation
BPSK, CCK, DSSS, QPSK
Security
WEP 64/128, WPA-PSK, WPA2, TKIP, AES-CCMP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Receiving
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
WISMC03BI
Wireless LAN Module / Device Server
FUNCTIONAL
DESCRIPTION
13 www.lairdtech.com
The Wireless LAN module is designed for use with a host system that implements a TCP/IP stack. It provides a
UDP stack and SLIP interface to allow fast integration. The integrated, high performance antenna together with
the RF and baseband circuitry provides the Wireless LAN connectivity and the UART interface for a connection
to a host system.
INTERFACES
UART Interface
Modem signal nomenclature can be a source of great confusion, particularly on devices which can be
configured in either DCE (Data Communications Equipment) or DTE (Data Terminal Equipment) format.
For the purpose of this data sheet all UART signals are defined on the assumption that the module is being
used as a conventional DCE. I.e it is behaving like a serial PSTN modem.
UART_TX, UART_RX, UART_RTS and UART_CTS form a conventional asynchronous serial data port with
handshaking, conforming to the ITU-T v.24 standard for DCE signalling. The interface is designed to operate
correctly when connected to other UART devices such as a 16550A. Note that the signalling levels are a
nominal 0V and 3.0V and are inverted with respect to the signalling on an RS232 cable. The interface is
programmable over a variety of baud rates, with no, even or odd parity, one or two stop bits and hardware
flow control. Non-standard baud rates are supported – for more information please contact Laird Technologies.
Auto-bauding is not supported.
On power-up the UART defaults to 115200,n,8,1.
Note that there is no standardization regarding the nomenclature of RX and TX across a DCE-DTE interface.
Some implementations show TX(DCE) connected to TX(DTE) to give naming consistency across a cable, whereas
other show TX driving RX to reflect logical port directions. Always check the direction of ports on DCE and DTE.
In a DCE mode, where the module is being driven as a peripheral by a host processor application, the UART
signals should be connected according to the following scheme:
Two-way hardware flow control is implemented by UART_RTS and UART_CTS. In DCE mode, UART_RTS is
an OUTPUT and is active low. UART_CTS is an INPUT and is active low. These signals operate according to
normal industry convention.
Some serial implementations link UART_CTS and UART_RTS to remove the need for handshaking. Laird
Technologies does not recommend linking UART_CTS and UART_RTS other than for testing and prototyping.
If these pins are linked and the host sends data at the point that the Wireless Module deasserts its UART_RTS
signal, then there is a significant risk that internal receive buffers will overflow which could lead to a loss
of data. Laird Technologies recommend that the correct UART_CTS to UART_RTS handshaking protocol
be adhered to in order to ensure proper operation.
The UART_DSR signal is an input to the module to place it in Powersave Mode 2.
The operation, meaning and direction of the UART_RI and UART_DCD signals is user programmable.
Note that the serial module output is at 3.0V CMOS logic levels. Level conversion must be added to interface
with an RS-232 level compliant interface.
Port UART_TX transmits data to the application’s /RXD input.
Port UART_RX receives data from the application’s /TXD output.
Laird Technologies