Inovance H3U Series - Chapter 5 High-Speed Input; Chapter 6 Positioning and Interpolation; Chapter 8 Electronic Cam; Chapter 9 Communication

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9 Communication9.2 Serial Port
9.2 Serial Port
9.2.1 Hardware and Communication Cable
COM0 is a standard RS-422 interface, and the interface terminal is an 8-hole mouse female connector. The
USB communication port is a MiniUSB interface.
Interface denition
1 2
5
8
4
7
3
6
Diagram of COM0 and MiniUSB program downloading ports
Pin No. Signal Description
1 RXD- Receives negative data.
2 RXD+ Receives positive data.
3 GND Indicates a ground wire, 9 and 10 not electrically connected.
4 TXD-/RXD-
Externally sends negative data, or receives negative data if the port
is an RS-485 interface.
5 +5V
Indicates external power supply +5 V, the same as the logical +5 V
used internally.
6 CCS
Indicates a communication direction control cable, high level for
"send" and low level for "receive". When the serial port is an RS-485
interface, the PLC controls sending or receiving data on pins 4 and
7. If the port is an RS-422 interface, the level keeps high, and pins 4
and 7 are used to send data.
7 TXD+/RXD+
Externally sends positive data, or receives positive data if the port is
an RS-485 interface.
8 NC Indicates no pin.
Through COM0, the PLC can be connected to a PC or touchscreen in two ways.
① Method 1: The PLC uses an RS-422 interface, and the PC uses a USB port. The PC is connected to the
COM0 program downloading port through a special USB downloading cable.
② Method 2: The PLC uses an RS-422 interface, and the PC uses an RS-232 interface. The PC is connected to
the COM0 program downloading port through a special serial port downloading cable.
H3U PLCs support USB-driven downloading. The USB driver is in the folder named
usb
in the background
installation directory.
COM1 is an RS-485 interface, and the interface terminal is a wiring terminal. The following gure shows the
interface denition.