Mulogic LLM336 Rack Card Voiceband Serial Modem 24V-48Vdc internal power supply (18-64Vdc) or (100-240Vac with power adapter sold sepreratly). This Serial Modem is for Conditioned Leased Lines(Analog) or Copper Lines support full and half duplex operation modes and can be used on point-to-point and multipoint lines over a communications line(2 wire or 4 wire operation). Unique feature that makes it possible to have half duplex and multipoint operation under control of the data signals only which allows for RS232,RS422 and RS485 devices (that cannot control the RTS signal) to control the modem carrier just by sending data. RS422/485 interface. Supports Modbus RTU,Modbus ASCII,DNP3,IEC 60870.5 and more. Under controlled circumstances the LLM-336.Eth can even operate on multipoint networks. For multipoint operation on unconditioned copper cable,the transmitter impedance is controlled and the receiver can be switched to high impedance. Operating temperature of -13 F to 158 F. Configured by means of DIP switches.