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Serial NB-IoT Port E840-TTL-NB03 Transceiver B8 Wireless M2M IPEX Frequency IoT IoT Frequency IPEX Serial B8 Wireless NB-IoT M2M E840-TTL-NB03 Port Transceiver
RS232 Serial RS485 E840-DTU(NB-03) Port Modem Wireless NB-IoT to Transmission Transmission to NB-IoT RS232 Port Modem Serial Wireless E840-DTU(NB-03) RS485