Modbus Port Configuration - Automationdirect.com DirectLOGIC DL205 Series User Manual

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".
230
240
• 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.
250-1
260
• 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.
Chapter 4: System Design and Configuration
NOTE: The DL250–1 does not support the
Echo Suppression feature
DL205 User Manual, 4th Edition, Rev. B
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