Embedded 4G Router Wlink D82 is Dual-Serial port Industrial Serial to IP cellular modem (called as DTU as well) which convert the serial data (RS232/485/422) into IP data and then transfer to data center through 4G mobile network Datasheet Application Firmware FeaturesMultiple operation modeAlways online: automatically attaches 4G Celullar when powered onautomatically redials when off line and keep line aliveOffline when idle and trigged online by user data, ring or SMSGPRS channel and SMS mutual backupOnline/offline control by commands via user equipmentData loop testMultiple data service centers communicationsSupports up to 4 data service centers communicationsSupports main/backup data service centers communicationsSupports customized setting for each data service centerFlexible and utilitarian data communicationsSupports TCP/IP, UDP/IP, DDPTM, SMS and ATSelf-defines transparent or protocol communicationsSelf-defines customized data frame separatorSelf-defines reconnecting intervalSelf-defines heart-beat data frameParameters configuration and remote managementBuilt-in parameters configuration menuConfiguration tool based on PCRemote parameters configuration via data service centerRemote parameters configuration by SMSParameters configuration via AT+ commands