CHAPTER 3Configuring the Gateway140• Slot interval - interval for saving data from the internal sensorsof the respective Wireless Modem, in seconds (minimum is 60seconds, maximum is 10800 seconds and the default is900seconds, or 15 minutes);• Ping interval - the interval within a status request from theWireless Modem should be made (minimum is 60 seconds,maximum is 10800 seconds and the default is 900seconds, or15 minutes);• First slot - displays the time stamp of the oldest data of theWireless Modem after the last configuration;• Last slot - displays the time stamp of the newest data of theWireless Modem after the last configuration.GPRS ModemsIn case of a GPRS modem, there is no real hardware installed onthe A850. Instead, the gateway listens on a specified port for TCPconnections from GPRS based RTUs, leaving the interfacingbetween GPRS and the TCP network to the GPRS phone providers.Note: as long as you don't get your own private access point byyour GPRS provider, the A850 gateway must be accessiblefrom the internet, either directly or by using an SSH server asproxy..The time being, only RTUs of the type A733GSM can be reachedvia a GPRS modem.
