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allowing a user to save states of counters or timers in case of power loss
"iSMA-B-4TO-H-IP I/O module with Modbus TCP/IP (with built in Modbus Gateway to RS485) or BACnetIP communication
Distech CDIDI-BOS8WWIFI EC-BOS-8 includes two isolated RS485 ports
"Siemens RLU220 Synco200
SFAR-1M-1TI1DO Industrial I/O module with Modbus RTU/ASCII communication - universal-io-modules allowing a user to saveSFAR 1M 1TI1DO Industrial I O module with Modbus RTU ASCII communication. The module has 1 temperature input (TI) and 1 digital output (DO). The temperature input can work with the most popular resistance temperature sensors and a wide range of thermocouples. The digital output is an NPN transistor output. All inputs and outputs are isolated from the logic with opto isolators. A built in RS485 interface allows an easy connection over the Modbus RTU
