![]() Sometimes a preliminary action is needed to write a value to a device, like some bit needs to be set first,then a write action will be valid (device specific) ![]() serial comm (baud rate, number for data bits, stop bits) or IP addressingīeyond that, there isn't much to configure for a slave for read actions. The slave will have data assigned to specific registers in a map/table of registers/addresses. HMI software can sometimes be either a master/client and a slave/server. ![]() Some things they don't tell you in the Modbus manuals.Ī field device, like a VFD or a single loop controller is always a slave/server.
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