Inovance MD880 Series - Communication

4 HCU Control Module
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Figure 4-11 Application example
4.9.4 Communication
The communication between the HCU control module and the SOP-20-880 or PC is
achieved through X11 and X12 terminals using RS485 mode, with one SOP-20-880 or
PC as the master, and multiple HCUs as the slaves. X11 and X12 are RJ45 terminals with
identical pin de󶍾nitions for cascading.
1) Connection with SOP-20-880
The SOP-20-880 is the master and the HCU is the slave. The PC can communicate with
the SOP-20-880 through USB. The far-end HCU on this link must be equipped with a
termination resistor.
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Figure 4-12 Connection with SOP-20-880
2) Connection with PC
The PC is the master, the HCU is the slave. A conversion module (RS485–RS232
converter or USB) is required between the PC and the HCU; the conversion module and
the far-end HCU must be equipped with a termination resistor.