1.0 FEATURES
•Operates on international licensed and licence free radio bands.
•RF Bands: 147MHz to 174MHz VHF
400MHz to 500MHz UHF 868MHz to 920MHz UHF
•Conforms to ETSI 300-220, ETSI 300-113, ETSI 300-683, MPT1329.
•Two Independently X7200HP Radio Modems in hot standby.
•17 selectable radio channels.
•RF Power 1W and 5W
•RS232/RS485 serial Interface with baud rates of 1,200 to 38,400.
•Service and monitoring RS232/RS485 serial port.
•Remote monitoring and configuration of outstation modems.
•Addressable individually and globally.
•On-line AT commands for network control.
•Variable Data Packets and error checking mode.
•1U, 19 inch rack mounted enclosure.
The X7220-2 Dual Redundant Base Station consists of two X7200 Radio Modems, two power supplies and an independent monitoring system. Only one Radio Modem is operational at any time with the other in hot standby. If any of the monitored parameters such as bit error rate, RF Power, RF sensitivity, Power Supply should exceed there pre-set limits then the second X7200 will be brought into service and the fault reported via the monitoring serial port and a relay contact closing. The in service radio modem will be changed automatically after a pre-set duty time.
A 4K buffer memory is provided on each radio modem so that data can be passed asynchronously between the host and modem without the need for handshaking. The CTS output signal on the communication port can be used for flow control in duplex applications. The over air data speed can be configured at either 5K bits/sec or 10K bits/sec. This is independent of the baud rate and should be set to a lower value where possible for the best radio propagation.
The set up menu of the X7220-2 can be accessed either by a PC running any terminal emulation program like Hyperterminal in the Accessories Section or remotely over the radio link. The set up menu is selected from the serial serves and monitoring port. The menu configuration is permanently stored on EEPROM.
On-line “AT” commands can be sent to the modem to change the address configuration or RF frequency during normal operation so that any modem can “dial up” any other modem on the network. The repeater path can also be altered.
The X7220-2 Dual Redundant Base Station is housed in a 19 inch rack and can be powered from 240V power source.
