The controller initiates read and write messages through available communication channels when configured for the following protocols:
• DH-485
• DF1 Full-Duplex
• DF1 Half-Duplex Master
• DF1 Half-Duplex Slave
• DF1 Radio Modem
• Modbus RTU Master
• Ethernet
If a Channel configured for Modbus Master is selected in the Channel field of the Message Setup Screen, the following Modbus Command options will become available:
• 01 Read Coil Status (0xxxx)
• 02 Read Input Status (1xxxx)
• 03 Read Holding Registers (4xxxx)
• 04 Read Input Registers (3xxxx)
• 05 Write Single Coil (0xxxx)
• 06 Write Single Register (4xxxx)
• 15 Write Multiple Coils (0xxxx)
• 16 Write Multiple Registers (4xxxx)
Modbus RTU Master Configuration
Select the Modbus RTU Master from the Channel Configuration menu as shown
below.
The Baud defaults to 19200.
The Control Line can be configured as:
• No Handshaking
• Full-Duplex Modem (RTS on)
• Half-Duplex Modem (RTS/CTS handshaking).
• No Handshaking (485 Network)
The Protocol Control defaults are:
• No Handshaking
• InterChar. Timeout = 0
• Pre Transmit Delay = 0.
When the system driver is Modbus RTU Master, the following communication
port parameters can be changed:
TIP: In order to connect directly to an RS-485 Modbus network, use a 1763-NC01 cable and configure the Control Line setting for No Handshaking (485 network).