However, the series A and B models only support MODBUS RTU SLAVE. Series C versions of the MicroLogix 1200's Mini-Din RS-232 “Channel 0” communications port supports DF1, DH-485, ASCII, MODBUS RTU SLAVE and MODBUS RTU MASTER. So for applications requiring Modbus you'll need to look elsewhere, as the MicroLogix 1000 does not support Modbus. Today’s MicroLogix 1000 still has just one Mini-Din RS-232 “Channel 0” communication port limited to DF1 and DH-485. It's a common question that clients ask, “Which MicroLogix's support Modbus?” In this article I'll detail the answer.
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