Specification and Implementation Guide for MODBUS over ...
At the physical level, MODBUS over Serial Line systems may use different physical interfaces (RS485, RS232). TIA/EIA-485 (RS485) Two-Wire interface is the most common. As an add-on option, RS485 Four-Wire interface may also be implemented. A TIA/EIA-232-
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Modicon Modbus Protocol Reference Guide
modbus.orgDOK-3Modicon Modbus Protocol Reference Guide PI–MBUS–300 Rev. J June 1996 MODICON, Inc., Industrial Automation Systems One High Street North Andover, Massachusetts 01845
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