WHM900 - RF Modem Modules
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Available: |
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900 - 928 MHz (ISM Band) |
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-40°C to +85°C Operating Temperature |
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Range - 500 ft with Antenna |
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256 User Selectable Channels |
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AT Command Support |
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Size: 1.0" x 1.0" x o.3" |
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The WHM900™ is a low-cost wireless modem module that operates in the license-free 900 MHz ISM frequency band range. The WHM900™ transfers data up to 1,000 feet with proper antenna. Its small size, user friendly AT Command support and other unique features, such as low power consumption and Serial TTL interface, make the WHM900™ ideal for OEM and VAR integration for high performance RF data communications. The WHM900™ is a FCC Part 15.247 / 15.249 approved RF module and requires no additional FCC approvals.
Features:
Industrial -40oC to +85oC operating temperature Long range – 300 to 500 feet with standard antenna 256 user selectable channels 32 user selectable frequency setting or full range frequency hopping On board NVRAM for storable configuration Low power consumption – 36mA / 28mA (TX/RX), 16mA idle mode Power down mode with only 4 mA power consumption AT command support Standard Serial TTL level compatible interface Small size – 1.0” x 1.0” x 0.3” (excluding antenna connector) Addressing for point-to-point and point-to-multi point applications Host interface baud rates from 300 bps to 19.2K, plus 57.6K Up to 76Kbps over-the-air data rate Supports hardware (RTS/CTS) and software (Xon/Xoff) flow control Auto link option for unattended operation
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RF Modem Development Kit |
| Radio Frequency |
900 – 928 MHz
(License-Free ISM Band) |
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Range |
Typically 300 to
500 ft with
standard antenna.
Up to 1000 ft with Yagi type antenna |
| Channels |
256 different user
selectable channels |
| Communication Technique |
Full RF range Frequency
Hopping or 32 user selectable frequency settings |
| RF Data Rate (bps) |
1200, 2400, 4800, 9600,
19.2K, 38.4K, 76.8K over-the-air |
| Transmit Level |
AT Command selectable
range – Max: +0dBm to Min: -20dBm |
| Modulation Scheme |
Frequency shift keying (FSK) |
| Coding |
Manchester mode |
| Frequency Separation |
Fixed at 64KHz intervals |
| Receiver Sensitivity |
Data rate and RF
frequency dependent |
| Data Interface |
Serial TTL compatible
with RS232 definitions |
| Data Mode |
Pseudo fill duplex –
share transmit and receive data paths to simulate full duplex
data transfers |
| User Interface |
AT Commands |
| I/O Data Rate (DTE) |
300, 1200, 2400, 9600,
19.2K, 57.6Kbps |
| Data Transfer Mode |
16 bit CRC error
corrected mode |
| DTE Tolerance |
Over speed / under speed
+/- 1% |
| Receiving Sensitivity |
- 106dBm @ 2,400 bps |
| Antenna Connectors |
Reverse
Polarity SMA |
| Antenna Impedance |
50 ohm unbalanced |
| Antenna Types |
¼ wave
omni-directional type with Reverse Polarity SMA Plug (Male) |
| Antenna
Gain |
maximum 2 dBi |
| Voltage Range |
3.0V to 6.0VDC operation |
| Current Consumption
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36mA / 28mA (TX/RX),
16mA (Idle Mode), 4mA (Power down mode) |
| Networking Capability |
Point-to-point, Point-to-Multipoint |
| Size (w/o antenna
connector) |
1.0” x 1.0” x 0.30”
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| Weight |
0.3oz or 7g |
| Operating Temperature |
-40oC to +85oC |
| Humidity
(non-condensing) |
10 to 90% |
| Agency
Approvals |
FCC
Part 15.247 and 15.249 certified |
Development Kit (MDK-2001) – Includes 2 each of WHM900 Wireless Modems, Development Interface Boards, RS232 Serial Cables, DB25 to DB9 Adapters, Power Adapters and ¼ wave RP SMA Antennas.
Mechanical Diagram & Pin Assignments - WHM900
Notes:
Pin spacing is 0.100" from center to center. Dimension of the modem without enclosure - 1.000" x 1.000" x 0.734" Pin 18 is not provided Suggested mating female connector: Molex P/N. 90147-1210 (www.molex.com) or equivalent" Square pins - 0.025" x 0.025" Tolerance in mechanical dimension is +/-0.002"
__________________________________________________________________________________________________________ Information furnished by Radicom Research is believed to be accurate and reliable. However Radicom Research assumes no responsibility for its use, or any infringement of patents or other rights of third parties which may result from its use. Radicom Research reserves the right to change circuitry at any time without notice. This document is subject to change without notice. The information contained herein is subject to change without notice. Logos, trademarks and copyrights are property of their respective owners. ^Back to top |
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