5.10 Modbus Communication Parameters
To access the Modbus device, you may first need to configure system-level communication parameters on the Gateway.
The following procedures are necessary to change the Gateway's slave ID, baud rate, and parity. Setting up the Network
and Device IDs, powering up the devices, and conducting the Site Survey for a host-connected network is the same as for
the non-host DX80 or DX80 Performance wireless system. All device I/O for the network is accessed using the host/master
device.
Parameter
Default Value
Description
Slave ID
1
Defines the slave number (01–99) for the serial Modbus RTU protocol. When operating more
than one network with a Modbus Master device, change the Slave IDs.
Baud Rate
19200
Defines communication data rate (19.2, 38.4, or 9.6 kbps) between the Gateway and the Host
through the serial interface.
Parity
None
Defines serial parity (none, even, or odd) between Gateway and Host.
5.10.1 Set the Slave ID on a DX80 Gateway
By default, all Gateways are set to Modbus Slave ID 1.
To change the Slave ID on the Gateway, follow these steps.
1. Single-click button 1 to advance between menus. Stop when you reach the DVCFG menu.
2. Press button 2 once at the *DVCFG menu to enter the Device Configuration menu.
3. Press button 1 to advance through the items in the *DVCFG menu. Stop advancing when you've reached the setting
for the slave ID (SLID).
The screen is displaying (SLID).
4. Press button 2 once to enter the slave ID (SLID) submenu.
The screen displays the current slave ID number.
5. Press button 1 to advance across the three digit slave ID while using the right rotary dial to select the number. To
make a change, rotate the right rotary dial to zero, then to the desired number.
As you press button 1 to select the digit, the digit changes to reflect the position of the right rotary dial. To set the
slave ID to 3, the display should read 003.
6. Press button 2 once to save your current setting.
The display reads SAVED.
7. Double-click button 2 to exit the *DVCFG menu.
8. If using a Network ID (NID), adjust both rotary switches back to the NID value.
To avoid losing the network connection between the Gateway and Nodes, reset the rotary switches back to their
appropriate values before leaving the *DVCFG sub-menus. If the Gateway and Nodes lose their connection, the
network may take up to 20 seconds to re-synchronize.
9. Double-click Gateway push button 2 to return to the Device Configuration (*DVCFG) menu.
10. Click Gateway push button 1 until reaching the *RUN menu option.
5.10.2 Set the Baud Rate
The baud rate establishes the communication rate between the Gateway and the host system to which it is wired.
1. Single-click button 1 to advance between menus. Stop when you reach the DVCFG menu.
2. Press button 2 once at the *DVCFG menu to enter the Device Configuration menu.
3. Press button 1 to advance through the items in the *DVCFG menu. Stop advancing when you've reached the setting
for the BAUD rate.
4. Single-click Gateway push button 2 to display the current setting. Single-click Gateway push button 1 to cycle
through the available options. Stop on the desired setting.
The options are 9600, 19200, 38400. The factory default is 19200.
5. Single-click Gateway push button 2 to save the new setting.
6. If using a network ID (NID), adjust both rotary switches back to the NID value.
To avoid losing the network connection between the Gateway and Nodes, reset the rotary switches back to their
appropriate values before leaving the *DVCFG sub-menus. If the Gateway and Nodes lose their connection, the
network may take up to 20 seconds to re-synchronize.
Sure Cross
®
Performance DX80 Wireless I/O Networks
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