The RFU-400 is an RS-232/RS-485 to 429 MHz radio modem that can be used to convert data from an RS-232/RS-485 device to an RF message that can then be transmitted in transparent mode via the 429 MHz ISM frequency band. The RFU-400 provides a maximum line of sight (LOS) transmission distance of 1000 meters (1 km) at an RF Baud Rate of 9600 bps. In order to overcome the interference that may be encountered in harsh environments, the RFU-400 allows the RF transmission Baud Rate to be configured to a minimum of 650 bps, enhancing the capability of the modem to resist noise and other interference. Additionally, the RF channels and Group IDs are adjustable, which is helpful when attempting to avoid interference encountered when two RFU-400 networks are adjacent. The 16 RF channels and 8 Group IDs can be configured in order to distinguish and control the different RFU-400 networks. The majority of these configuration parameters can be adjusted using a combination of the Rotary and DIP switches, thereby providing a simple method of maintaining the system if the RFU-400 modem needs to be replaced.
| RF Interface |
| Radio Frequency |
Channel 0 ~ 9 : 429.8125 MHz ~ 429.9250 MHz
Channel A ~ F: 429.1750 MHz ~ 429.2375 MHz |
| Baud Rate |
115200 bps, 38400 bps, 9600 bps, 650 bps |
| Transmission Power |
PA Off : 10 dBm , PA On : 19 dBm |
| Antenna |
0 dBi Omni directional |
| Transmission Distance (LoS) |
1000 m (at 9600 bps RF Rate) |
| Group ID |
0 ~ 7 |
| Protocols |
Transparent transmit |
| Temporary Buffer Size |
512 Bytes |
| Configuration |
Rotary and DIP switch |
| COM Port Interface |
| RS-232 |
TxD, RxD and GND |
| RS-485 |
D+, D- ; 3000 VDC for DC-to-DC |
| Baud Rate (bps) |
1200 ~ 115200 |
| Data Format |
N81, E81, O81 |
| LED Indicators |
| RF_Tx |
Green |
| RF_Rx |
Yellow |
| PWR |
Red |
| Isolation |
| Intra-module Isolation |
2500 Vrms for photocoupler (RS-485/RS-232 side) |
| EMS Protection |
| ESD |
+/- 4 kV Contact |
| EFT |
+/- 1 kV |
| Surge |
+/- 1 kV |
| Power |
| Input Voltage Range |
+10 VDC ~ +30 VDC |
| Power Consumption |
1 W (Max.) |
| Mechanical |
| Flammability |
Fire Retardant Materials |
| Dimensions (W x L x H) |
108 mm x 84 mm x 33 mm ( not include antenna ) |
| Antenna Dimensions (L x Ø) |
108 mm x 10 mm |
| Installation |
DIN-Rail |
| Environment |
| Operating Temperature |
-25 °C ~ +75 °C |
| Storage Temperature |
-30 °C ~ +80 °C |
| Relative Humidity |
10 ~ 90% RH, Non-condensing |
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