If you don’t see this indicator light blinking on your HMI, it’s probably a wiring cable problem. Wirring from the HMI to the RS232 3 position plug of the ACE Wirring of the HMI serial port HMI D-sub 9 pins However, the shield should only be connected at one end of the cable. The ground can be connected to the cable shield.

the – (or B), on the middle pin or RS232’s TX pin.

the + (or A), on the same pin as the RS232’s RX.

If the port is configured for RS485, the two connections used are When configured as RS232, the connections are identical to the connections shown for the dedicated RS232 ports. Some ACE have serial ports that can be configured as either RS232 or RS485. Figure 9 2-Wire Wiring Diagram for the 605A & B Drive (Modbus only).

RX (must be connected to TX pin of the connected device) The MODBUS RTU (Remote Terminal Unit) protocol is an efficient binary protocol in.

TX (must be connected to RX pin of the connected device).

The illustration on the right shows the connections. It is NOT a TTL level (0 / 5 VDC) : A logic high is represented by a negative voltage -5 while a logic low transmits a positive voltage +5 V.ĪCE RS232 ports have three pin connectors.

Our serial port is a true standard RS232/485.

RS485 ports are commonly used in multi-unit systems and for longer distance communictions.

They are also commonly used to interface cellular transceivers for internet of things applications and can be used in ASCII communications mode to communicate to any device that has an RS232 port. 2.4 Entering the Modbus node address The default value for the Modbus node address is 1.

Repeat steps 1 to 4 inclusive for each unit that is to be connected in series. RS232 ports are commonly used for interfacing HMI and other devices through Modbus RTU communications. Connect the cable in the second unit to terminal block X380, in accordance with the wiring diagram.

Certain ACE have RS232 ports or configurable RS232/485 ports.

Modbus rtu wiring diagram