H-4401 & H-4410 Radio Links & Tranceivers
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H-4401M Radio Link "DAA-SDI" Master Side - connected to a RS-232 serial port on the data logger (instead of the SDI-12 port).
H-4401S Radio Link "DAA-SDI" Slave Side - One or more H-4401S (slave) units are located at the remote sensor sites. The-H-4401 bridge works by sending and receiving SDI-12 communications as ASCII messages, without the timing restrictions of the SDI-12 protocol
H-4410-M RS-232 Repeating Radio Transceiver Master Side
H-4410-S RS-232 Repeating Radio Transceiver Slave Side