CIRCUTOR TCP1RS+ User Manual

CIRCUTOR Measuring instruments

Table of contents

Document Outline

As the unit is connected to the master communication system by means of an IP connection, the addressing parameters must be configured. The configuration modes include the assignment of a fixed IP or configuration of a DHCP name.
To configure the IP address configuration in any of the available formats, run the IPSetup.exe executable supplied with the unit.
Run IPSetup and select the TCP1RS+ converter. To assign the fixed IP address, enter the MAC address shown on the permanent side label attached to the device, the format of which is 00:26:45:XX:XX:XX.
In the IP Address field, enter the IP address being configured; do the same with the Netmask and the Gateway if necessary. After entering the device configuration, press “Configure” to send the configuration to the unit.
To assign the DHCP name, activate this option by clicking on the DHCP checkbox. Once the configuration fields have been enabled, enter the MAC address that can be seen on the permanent side label attached to the device, the format of which is 00:26:45:XX:XX:XX. In the Address, field, enter a free temporary IP address, which is within the working range of your computer.
Once the unit is connected to the Local Area Network (LAN) and the IP address is configured or in the DHCP mode, the remaining configuration can be established in the IPSetup software console. When the unit has been fully configured, the configuration can be sent by clicking on “Configure”.
The unit can be connected to the master communications system by means of three types of network protocols and to a configurable port (TCP, UDP or Modbus/TCP).
The communication parameters of the serial bus are fully configurable in terms of baud rate (1.2 bps to 115.2 kbps), data bits (7 or 8), parity (none, odd or even) and stop bits (1 or 2). The data will be configured by default to 8 by selecting the Modbus/TCP communications protocol.
When the unit is connected with IPSetup, the top part of the screen shows the firmware version and the machine address of the device (the same address as that shown on the permanent side label).
Once any change has been made to the aforementioned sections, the information must be saved using the “Configure” option. If you wish to return to the default configuration, select “Load default”.
In the TCP/IP protocol stack, TCP is the intermediate layer between the Internet protocol (IP) and the application. In general, applications need reliable communications. The IP layer offers an unreliable datagram service (no confirmation), so the TCP adds the functions required to offer a secure, error-free and zero loss service for the communications between two systems.
User Datagram Protocol (UDP) is a minimum transport level message-oriented protocol that has been documented in the RFC 768 of the IETF.
In the Internet protocol family, UDP provides a simple interface between the network layer and the application layer. UDP does not offer guarantees for the delivery of its messages and the UDP origin does not withhold the states of UDP messages sent to the network. UDP only adds the multiplexing functionality to the application and the verification sum of the header and useful load. Any type of guarantees for the transmission of information must be implemented in higher layers.
Modbus/TCP is a variation or extension of the Modbus® protocol, which enables it to be used on the TCP/IP transport layer. Therefore, Modbus/TCP can be used throughout the Local Area Network or the Internet. This was one of the objectives that motivated its development (the specification of the protocol was submitted to the IETF, Internet Engineering Task Force).
The TCP1RS+ converter uses two communication parameters to control the Modbus frames on the RS485 bus.