Communication

Settings

• Ethernet*

  • IPv4 configuration

  • DNS server

  • Hostname

• RS-485

  • Modbus mode

  • Device ID

  • Baud rate

  • Stop bits, parity

  • Modbus timeout

Ethernet*

IPv4 configuration

You can choose between different types of address assignment in the network:

• Fixed IP address (static): Assign a permanent IP address, netmask and gateway to the device ("Static"). Use this mode for simple networks with no DHCP server.

• BootP: Automatically integrates your device in an existing network. BOOTP is an older protocol and has a smaller range of functions than DHCP.

• DHCP: The measurement device is automatically assigned an IP address at startup. The following fields are automatically filled with the assigned values and are grayed out.

• Fixed IP address with ARP test: Assign a permanent IP address, netmask and gateway to the device, and the device will automatically log in to the network with IP and MAC address ("Static Gratuitous ARP").

• BootP with ARP test: Simplified protocol for the automatic assignment of IP addresses to the MAC addresses. The device automatically logs into the network with IP and MAC address.

• DHCP with ARP test: Protocol for the automatic assignment of IP addresses to the MAC addresses. The device automatically logs into the network with IP and MAC address.

If you decide to use a fixed IP address, you must configure the following settings: IP address, subnet mask and standard gateway.

Example image: UMG 96-PA-MID+

DNS server

This is the IP address of the Domain Name Server (DNS), which is a system used to associate domain names with IP addresses.

Hostname

The hostname is the name of the measurement device for communication within the network.

RS-485

The measurement device can communicate via the RS-485 interface using the "Modbus RTU" protocol.

Modbus mode

• Modbus Master(Gateway): This measurement device is configured as a gateway, i.e. it is connected to a higher-level PC or server via Ethernet (Modbus TCP).
  Several measurement devices or other devices can be connected to the gateway via RS-485 (Modbus RTU). With Modbus RTU, the gateway acts as a client (old designation, "master") that initiates the communication.

• Modbus slave: This measurement device is configured as a server (old designation, "slave"), which responds to the requests of the gateway (client).

Device ID

Assign a device address to the device which can be used to address the device in the bus structure. Each device address exists only once in a bus structure!

Baud rate

Select a uniform baud rate for all devices in the bus structure!

Stop bits, parity

Select a uniform data frame for all devices in the bus structure.

Modbus timeout

If a Modbus device does not respond to a request within the specified time, this is considered a timeout. The gateway responds with a Modbus exception.

Example image: UMG 96-PA-MID+