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We have Redhat Linux petium-3 pc having c218 MOXA asyc 8port(RS-232) serial card. Through this card one of the ports we want to access PLC modbus RTU slave (from RSTHAL). Can we emulate modbus RTU master at linux system without modbus driver? We tried the standard modbus protocol RTU format frames i.e slaveno, functioncode, addresshigherbit, addresslowerbit, no. pts higherbit, lowerbit, CRClowbit, CRChighbit from redhat linux pc. But there is no response from the RTU slave. But from Windows-NT pc vendor send program is able to send
frames and able to get reply from slave.
Please let me know the bare standard Master RTU frame format generation alone is not enough to get response from slave. Any driver software have we to install at the linux pc?
frames and able to get reply from slave.
Please let me know the bare standard Master RTU frame format generation alone is not enough to get response from slave. Any driver software have we to install at the linux pc?