PRM 4 is packet radio modem intended for wireless transfer of serial protocols in unlicensed ISM 868MHz frequency range. It has RS-232 DCE, as well as two wire or four wire RS-422 or RS-485 interface. On front panel there are LED indications for power supply, receive, transmit and error in channel. Range up to 2km is achieved with small rod antenna and up to 16km with high gain antenna. Device power supply range is 8-32Vdc. PRM 4 is shipped in desktop version or with optional 35mm DIN rail mounting carrier.
Packet radio modem of fourth generation can be used in industrial environment where there are no conditions for wire interconnecting of communication equipment, as it is with moving and rotating machines, natural and artificial barriers, as well as in situations where simple and fast interconnection is requested without mounting of additional wires. It enables interconnection of several communication devices in wireless network, with range extension thanks to repeater working mode. AT command interface is intended for parameters setting.
| Frequency range | ISM 868MHz, according to EN 300 220 |
| Channel range and number | 25kHz, 80 channels |
| Transmit power | +13dBm, 20mW |
| Modulation | 2FSK with Gaussian filtration |
| Radio signaling rate | 9600bps |
| Receiver sensitivity | better than -115dBm for 10-3 BER |
| Channel occupation time | less than 1% |
| Range | up to 2km with rod antenna, 16km with high gain antenna |
| Serial interface | 8 data, None parity, 1 stop bit 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 |
| Serial connector DB9 DCE | RS-232: Tx, Rx, RTS, CTS, DTR, DSR, DCD, RI, GND RS-422: Tx+, Tx-, Rx+, Rx-, GND (2W/4W selectable) RS-485: Tx+, Tx-, Rx+, Rx-, GND (2W/4W selectable) Termination 120 Ohm for RS-422 and RS-485 selectable |
| Power supply | 8-32Vdc, 2W |
| LED indications | power supply, receive, transmit, error in channel |
| Temperature range | -20°C to +75°C, 0 to 95% RH (non condensing) |
| Protection | IP50 |
| Dimensions | 86 x 57 x 26 mm |
| Mounting | desktop or optional mounting for 35mm DIN rail |
| Model | SKU | Description | Price | |
| PRM 4 | 10171 | Packet radio modem for ISM 868MHz frequency range | €149 |
*Minimum functionality kit needs to include the device, appropriate power supply and antenna. Please note that all accessories are sold separately.
| Model | SKU | Description | Price | |
| ANT-868-S | 10293 | 868Mhz Swivel antenna, 2.2 dBi, SMA | €7 | |
| PS-1212-AD | 10261 | AC/DC adapter, DC12V 12W, AC100-240V 50/60Hz | €8 | |
| PS-2415-DIN | 23601 | Power supply, DIN rail mount, DC24V 15W, AC85-264V 50/60Hz | €11 | |
| CB-DB9MF-2M | 21745 | Serial Cable Assembly 1.8~2m, DB9 Male to DB9 Female | €4 | |
| ENCL-DIN35-H1 | 20271 | 35mm DIN Rail Holder, Aluminium | €2.50 |
