Use Case:

The "HZS232 RS232 to RS485 snooper" facilitates the monitoring of a full-duplex RS232 link in a minimally intrusive and low risk manner.

It is designed primarily for the monitoring of data links in safety critical, high reliability systems, such as Railway Signalling TDM control systems.

Key Features:

• Separate high impedance, fault tolerant input buffers monitor RS232 transmit and receive lines.
• Buffered RS232 to RS485 protocol conversion prevents downstream monitoring systems from injecting data into the RS232 line.
• RS485 output allows long-distance wiring runs, and provides enhanced electromagnetic immunity between HZS232 and monitoring equipment.
• 1 kV galvanic isolation barrier guards against ground loop problems, unintentional earth paths, or other unwelcome circuit connection.

System Diagram:

Indications

The HZS232 incorporates 3 x Indication LED's to aid the identification of correct operation.

Wire Termination

• Wire termination is via 5 mm-pitch 8-way connectors.
• The connector assignment has been arranged such that the monitored system shall not be compromised if the plug is inserted into the incorrect socket of the HZS232.
• The correct terminations are clearly marked on the product.
• Reading from left-to-right, the correct pin assignment is further detailed below:

Specification