RS485/RS232/RS422 Wireless Data Transceiver
SG-M304
SG-M304 is a module of DATA transmission integrated with voice communication. Specially designed for automatic industry with high reliability and stability. Provide voice transmission channel, can be connected to a microphone or loudspeaker directly, very easy to extend its functions and applications by the clients. And moreover, we are always ready for your OEM.
Features:
Use TCXO and digital PLL advanced technologies, high stability;
Integration of transceiver, both digital and analog signals can be send and switch quickly;
Steady outsell, good hidden and stronger anti-interference;
Industrial designes, work temperature: -40~+70℃;
Several kinds of interfaces for choice: RS-232, TTL, RS-485;
DATA Format: 8N1/8E1/8O1( Customized )
Antenna Impedance: 50Ω (SMA Customized)
Application:
1)Remote reading system of water, electric and gas supply;
2)Building Automation, security & protection, access control system;
3)Wireless calling system;
4)Spot management, station management;
5)RF transmitter Wireless electronic display screen and queuing machine;
6)Electronic bus station and intelligent traffic;
7)Alarm systems.
Specification:
Frequency: VHF/UHF ( 223-235MHz )
Power: 500mW
Frequency stability: ± 2.5ppm
Mode: half-duplex
Channel spacing: 25KHz
Voltage: DC 12V ( Customized )
Transmission distance: 2km
Receiver index:
Usable sensitivity: ≤0.25μV (12dB SINAD)
Adjacent channel selectivity: ≥70dB
Spurious Response Immunity: ≥ 65dB
Adjacent channel power ratio: ≥70dB
Audio Output: 0.5W(8Ω, 10% Distortion)
Distortion: ≤3%
Current: ≤ 50mA
Transmitter index:
RF Output: 500mW
Adjacent channel power ratio: ≥70dB
Modulation Distortion: ≤3%
Modulation Sensitivity: 5mV
Current: ≤300mA
Size: 70*46*8mm
Interfaces definition:
| Name | Description | Level | Remark |
1 | VCC | DC | 12 V
| DC 12V ( as good in range 7.5~15V), or customized |
2 | ||||
3 | GND | GND | --------- | ----------------- |
4 | ||||
5 | A(TXD) | RS-485 A or TXD of RS-232 |
| Either RS-485 or RS-232 |
6 | B(RXD) | RS-485 B or RXD of RS-232 |
| |
7 | PTT | Transmit control | TTL | Low level validity |
8 | MIC | Audio input | -------- | Recommend 1K-2K, -27dB sensitivity of microphone |
9 | SP | Audio output |
| 8Ω 0.5 |
10 | SQ | Receiving indication | TTL | High-level |
Complete set of equipment:
1. One module of SG-M304;
2. 10 pin flat connector;
3. A whip antennas ( about 10cm)
Antenna configuration:
Many appropriative antennas for low power RF modules are selected to meet different user’s antenna configuration. Please ask our Sales office for further information about the antenna’s dimension and performance. The main options of antennas are exterior flabelliform rubber antenna with helical SMA joint, small osculum antenna, small rod antenna and elbow antenna. If the user has special demands on antennas, we can design and produce individually.