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China WD889/WD250 Multi Channel FM Transceiver & Wireless Modem - Reliable Suppliers & Factory Solutions
WD889:25W Size: (L x W x H)137x135x44mm
WD250:20W Size: (L x W x H)124.7x76x34mm
MD1200 MODEM
Data transmission mode:Transparent
Modulation mode:FSK (f1=1.3KHz f2=2.1KHz)
Transmission rate:75-1200bps self-adaption
BER:10-7(S/N=20dB)
Communication interface:RS232/RS485/TTL
Temperature:-40℃～+70℃
Voltage:DC+7～+15V or +5V
Current:RS232: <30mA; RS485: <60mA
Installation size:59.5x39.3mm
Adapter model:250A/WD889/WD886 etc.
MD4800 MODEM
Data transmission mode:Transparent/Intelligent
Modulation mode:FFSK
Wireless transmission rate:1200/2400/4800bps
Interface transmission rate:1200/2400/4800/9600bps
Address code/Data format:Programmable setting
BER:10-7(S/N=20dB)
Communication interface:RS232/RS485/TTL
Temperature:-40℃～+70℃
Voltage:DC+7～+15V or +5V
Current:RS232: <30mA; RS485: <60Ma
Installation size:59.5x39.3mm
Adapter model:250A/WD889/WD886 etc.
MD19200 MODEM
Data transmission mode:Transparent/Intelligent
Modulation mode:GMSK/CPFSK
Wireless transmission rate:9600/19200bps
Interface transmission rate:1200/2400/4800/9600/19200bps
Address code/Data format:Programmable setting
BER:10-7(S/N=20dB)
Communication interface:RS232/RS485/TTL
Temperature:-40℃～+70℃
Voltage:DC+7～+15V
Current:<40mA
Size (L x W):60x50mm
Adapter model:250A/889/886/250G/258G etc.
MD38400 MODEM
Data transmission mode:Transparent/Intelligent
Modulation mode:GMSK/CPFSK
Wireless transmission rate:38400bps
Interface transmission rate:38400bps
Address code/Data format:Programmable setting
BER:10-7(S/N=20dB)
Communication interface:RS232/RS485/TTL
Temperature:-40℃～+70℃
Voltage:DC+7～+15V
Current:<40mA
Size (L x W):60x50mm
Adapter model:250A/889/886/250G/258G etc.
Frequently Asked Questions (FAQ)
What are the transmission rates of the different MD series modems?
The transmission rates vary by model: MD1200 supports 75-1200bps self-adaption; MD4800 supports 1200/2400/4800bps wirelessly; MD19200 supports 9600/19200bps; and MD38400 supports 38400bps.
What communication interfaces do these modems support?
All models (MD1200, MD4800, MD19200, and MD38400) support standard RS232, RS485, and TTL communication interfaces, providing flexible connectivity options.
What is the operating temperature range for these devices?
These modems are built for rugged environments and can operate reliably within a wide temperature range of -40℃ to +70℃.
Which adapter models are compatible with the MD series modems?
Depending on the specific modem model, they are compatible with adapter models such as 250A, WD889, WD886, 250G, and 258G.
What are the dimensions of the WD889 and WD250 units?
The WD889 measures (L x W x H) 137x135x44mm, while the WD250 measures (L x W x H) 124.7x76x34mm.
What are the voltage and current requirements for the MD1200 and MD4800?
Both the MD1200 and MD4800 require a voltage of DC+7～+15V or +5V. Their current consumption is less than 30mA for RS232 and less than 60mA for RS485.