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BELDEN MODBUS RS-232 SHIELDED TWISTED PAIR CABLES

Application

Modbus ASCII and Modbus RTU
Modbus ASCII and Modbus RTU are protocols that have become the de-facto standard in many applications. The protocol was developed at the end of the seventies by Modicon (now Schneider). Devices connected to Modbus ASCII and Modbus RTU communicate serially over RS-232 or RS-485.

Modbus Plus
Modbus Plus is an industrial application network that utilises token exchange, peer-to-peer communication. Token exchange and peer-to-peer involves communicating over a logical ring where all nodes can initiate communication, however, a node can not send until it has obtained the token. The interface is based on RS-485.

MODBUS/TCP
MODBUS/TCP is an Ethernet variant of MODBUS, a straightforward supplier independent communications protocol for control and monitoring of automation equipment. The protocol utilises the properties of MODBUS with the communication media being the TCP/IP protocol which can traverse intranets or the internet. Using a RS-232 physical interface, the maximum distance would be 15m at 10kbps. Using a EIA-485 physical interface, the maximum distance would be 1219m at 100kbps. A maximum of 247 nodes are possible.

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