DL205 User Manual, 4th Edition, Rev. D
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Chapter 4: System Design and Configuration
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Modbus Port Configuration
In DirectSOFT, 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: The 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: To make the CPU
port a Modbus master, choose “1.” The
possible range for Modbus slave numbers
is from 1 to 247, but the DL250–1 and
DL260 WX and RX network instructions
used in Master mode will access only
slaves 1 to 90. Each slave must have a
unique number. At powerup, the port is
automatically a slave, unless and until the
DL250–1 or DL260 executes ladder logic
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.
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