Modbus Port Configuration
In
Direct
SOFT, choose the PLC menu, then Setup, then “Secondary Comm Port”.
• Port:
From the port number list box at the top, choose “Port 2”.
• Protocol
: Click the check box to the left of “MODBUS” (use AUX 56 on the HPP, and select
“MBUS”), and then you’ll see the dialog box below.
• Timeout:
Amount of time the port will wait after it sends a message to get a response before logging
an error.
• RTS On Delay Time:
The amount of time between raising the RTS line and sending the data.
• RTS Off Delay Time:
The amount of time between resetting the RTS line after sending the data.
• Station Number:
For making the CPU port a Modbus master, choose “1”. The possible range for
Modbus slave numbers is from 1 to 247. Each slave must have a unique number. At powerup, the
port is automatically a slave, unless and until the DL06 executes ladder logic MWX/MRX network
instructions which use the port as a master. Thereafter, the port reverts back to slave mode until
ladder logic uses the port again.
• Baud Rate:
The available baud rates include 300, 600, 900, 2400, 4800, 9600, 19200, and 38400
baud. Choose a higher baud rate initially, reverting to lower baud rates if you experience data errors
or noise problems on the network. Important: You must configure the baud rates of all devices on
the network to the same value. Refer to the appropriate product manual for details.
• Stop Bits:
Choose 1 or 2 stop bits for use in the protocol.
• Parity:
Choose none, even, or odd parity for error checking.
• Echo Suppression:
Select the appropriate radio button based on the wiring configuration used on
port 2.
Then click the button indicated to send the Port configuration to the CPU, and click Close.
DL205 User Manual, 4th Edition, Rev. B
4–46
Chapter 4: System Design and Configuration
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