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Related Manuals for YEONHWA M TECH MD Series
Summary of Contents for YEONHWA M TECH MD Series
- Page 1 User Manual VHF Transceiver MD-100D UHF Transceiver MD-400D...
- Page 2 Version #1 (2017-08-01) YeonHwa M Tech Co., Ltd. 36, Jeonparo 44beongil, Manangu, Anyangsi, Gyeonggido, Korea Tel: 82-31-444-7270 MD-400D User Manual 1. MD-420D Digital RF Modem Specification The MD-Series standardized the specifications of the instrument exterior and connectors so that the digital RF modem can maintain compatibility with existing analog modems.
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Page 3: Specification
2. Specification 2.1 MD-Series Specification General MD-100D : 136~174 MHz Frequency Range MD-400D : 400 ~470 MHz Frequency Stability ±1.5ppm (-30 to +60℃) Programmable Channels 1 Zones / 32 Channels Channel Spacing 12.5KHz Digital Vocoder AMBE++ Dimensions 103mm(H) x 52mm(W) x 32mm(D) Weight 280g Power Source... - Page 4 Audio Frequency Response +1, -3dB from 6dB per octave pre-emphasis Characteristic from 300 ~ 3000Hz Output Impedance 50ohms 3. MD Series Components 3.1 Equipment name * Components may differ according to the request of buyers. Figure 3-1) MD-400D Series Component...
- Page 5 3.2 Status Display LED This is LED which displays the equipment status. The main status display is as follows: ① Red color when normal transmission ② Green color when normal receive 4. How to use MD-400D Series 4.1 Message transmission and receive tools You can send and receive messages through the AT Command, but the PC tool is provided to make it easier to use.
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Page 6: Basic Protocol
Figure 4-1) Message tool 4.1.1 Messages It is possible to send and receive messages between the modem and the modem, and between the modem and the terminal. By providing the PC interface as above, convenient configuration is possible. You can configure the file or database connection to store additional messages. Since it is based on PC, it can be saved as much as the capacity of the PC can be allocated, so it can be seen that the capacity is not limited. - Page 7 Figure 4-2) Normal Message Transmission and Receive Method Figure 4-3) Action on Message Transmission Error If an error occurs in the delivery of the message, the specified number of retries will be retransmitted after 5 seconds. Finally, there is no format restriction of characters, and it supports messages of up to 80 characters 4.1.3 AT Command Use AT Command to set the status of the transceiver(radio) or to use the function.
- Page 8 Parameters <value1> S/W Version Example AT*VERSION *VERSION:YEONHWA Modem v1.0 2) Modem Status verify command (CHKSTAT) Description Command to verify modem status Query 2. AT*CHKSTAT Answer *CHKSTAT:<value1> Parameters <value1> STAT OK – Normal status STAT ERROR – Error status Example AT*CHKSTAT *CHKSTAT:STAT OK 3) Modem information verify command (MINFO) Description...
- Page 9 Example AT*MINFO *MINFO:1,440.000,1,1 4) Modem Reset (RESET) Description Command to reset modem Query AT*RESET Answer RESET Parameters <value> Reset the modem Example AT*RESET RESET Going down terminal… 5) Sending Message (MSG) Description Command use when sending message Query AT*MSG=<value> Answer MSG OK Parameters <value>...
- Page 10 Command use when receiving message Answer RMSG=<value> <value> Parameters Receive message Example RMSG=TEST 7) Check channel list (CHLIST?) Description Command to verify when receiving message Answer AT*CHLIST? Parameters CHNUM: <value> : Current channel number Whole channel number: Classified channel number, RX frequency, TX frequency …...
- Page 11 Example CHNUM:01 01:0:ANA,RX:441000000,TX:441000000 02:1:ANA,RX:423600000,TX:423600000 03:2:ANA,RX:423612500,TX:423612500 04:3:ANA,RX:423625000,TX:423625000 05:0:DMR,RX:440000000,01,TX:440000000,01 06:1:DMR,RX:423200000,01,TX:423200000,01 07:2:DMR,RX:423212500,02,TX:423212500,02 08:3:DMR,RX:423225000,03,TX:423225000,03 09:4:DMR,RX:423237500,04,TX:423237500,04 10:5:DMR,RX:423250000,05,TX:423250000,05 11:6:DMR,RX:423262500,06,TX:423262500,06 12:7:DMR,RX:423275000,07,TX:423275000,07 13:8:DMR,RX:117440512,07,TX:117440512,07 14:9:DMR,RX:117440512,07,TX:117440512,07 15:10:DMR,RX:117440512,07,TX:117440512,07 16:11:DMR,RX:117440512,07,TX:117440512,07 8) Channel setting (CHSET) Description Command to verify when receiving message Answer AT*CHSET=<value> Parameters <value> Channel number Example AT*CHSET=3 CH:03 5. For Safe Operation 5.1 Precautions Do not remove the antenna from the radio or do not transform the antenna or do not make any changes on the antenna.
- Page 12 Do not use accessories (such as rechargeable battery, adaptor, external speaker microphone and earphone etc.) from the other makers, which can cause defect on battery and malfunction or a defect on the radio. Do not disassemble or reorganize the radio. The disassembly or reorganization will cause a defect or malfunction on the radio.
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Page 13: Safety Notes
Please do not use the radio at the place where computer or other electric/electronic devices are being used. The strong electronic wave from the radio can have an effect on the equipment. 6. Safety Notes Please make sure to read the followings above for safe and effective use of the radio. •... - Page 14 8. Usage Application ▪ Water/Waste Treatment ▪ Plants Oil and Gas Field, SCADA ▪ Security/Alarm System ▪ Gate Systems, Remote Controls ▪ Commercial Sign Control ▪ Automatic Vehicle Location ▪ Murphy/Kill Switches ▪ Weather Monitoring ▪ Irrigation Systems ▪ Emergency Call Boxes ▪...
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Page 15: Warranty Statement
Warranty Statement Thank you for purchasing MD-100D/ MD-400D Series. 1. This product has passed strict quality control and testing process by YeonHwa M Tech. 2. Warranty is one year from the day of release. • When there is malfunction of the product under normal operating conditions during the warranty period, your authorized dealer and the service center will repair it free of charge.