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.
| Isolation |
| Intra-module Isolation |
2500 Vrms for photocoupler (RS-485/RS-232 side) |
| EMS Protection |
| EFT (IEC 61000-4-4) |
+/- 1 kV |
| ESD (IEC 61000-4-2) |
+/- 4 kV Contact |
| Surge (IEC 61000-4-5) |
+/- 1 kV |
| LED Indicators |
| Status |
1 x RF_Tx
1 x RF_Rx
1 x PWR |
| RF |
| Antenna |
0 dBi Omni directional |
| Baud Rate |
115200 bps ~ 650 bps |
| Configuration |
Rotary and DIP switch |
| Group ID |
0 ~ 7 |
| Protocol |
Transparent transmit |
| Radio Frequency |
429.1750 ~ 429.9250 MHz |
| RX Sensitivity |
433.1000 ~ 434.6000 MHz |
| Temporary Buffer Size |
512 Bytes |
| Transmission Power |
Max 19 dBm |
| Transmission Distance (LoS) |
1000 m (at 9600 bps RF Rate and 19 dBm Tx Power) |
| COM Ports |
| Ports |
1 x RS-232 (TxD, RxD and GND)
1 x RS-485 (D+, D- ; 3000 VDC for DC-to-DC) |
| Baud Rate |
1200 ~ 115200 |
| Data Format |
N81, E81, O81 |
| Power |
| Consumption |
1 W (Max.) |
| Mechanical |
| Casing |
Fire Retardant Materials |
| Dimensions (mm) |
108 x 84 x 33 (W x L x H)( not include antenna ) |
| Installation |
DIN-Rail |
| Environmental |
| Operating Temperature |
-25 ~ +75°C |
| Storage Temperature |
-30 ~ +85°C |
| Humidity |
10 ~ 95% RH, Non-condensing |
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