RS485 Interface Products

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RS485 Repeater	RS485 Repeater Manual
	Doubles allowable network distance Protects network by electrically isolating the ports of the repeater to 1KV Two or four wire, half or full duplex operation Allows multiple bus masters Facilitates RS485 communication when it is not normally feasible Saves costly cable and cable laying Static discharge protection fitted as standard

The RS485 data transmission standard requires that each network node be linked via a single transmission line terminated at each end in its characteristic impedance. Furthermore the total transmission line length is limited to approx. 1Km.

Sometimes it is necessary to transmit over longer distances, or to run networks with spurs off the main cable run. The model R485i opto-isolated repeater solves these problems by creating a second network electrically isolated from the first. It receives signals on one network and re-transmits them on another. The opto-isolation coupled with the ESD / static discharge protection, which is fitted as standard, makes the network less susceptible to damage from nearby lightning strikes or other differences in local earth potential.

To order repeaters or for more information please e-mail: Dave Cooper

USB to RS485 & USB to RS232 Converters

MEV'S  fast USB to serial converters provide legacy RS232 or RS485 serial communication interfaces to computers with USB support.

Many modern Desktop and Laptop PCs do not have serial ports as standard but all have USB ports. The USB232/485 range provide a compact and cost effective solution to interfacing new PCs to existing RS232 and RS485 networks

The RS485 converters have big advantages over traditional methods of accessing RS485 networks from PCs. The converters take their power from the USB port and therefore require no external power supply, a big advantage in portable and industrial applications. The USB485i is fully opto-isolated giving valuable protection to the PC in harsh environments. Another big advantage of the USB485 is that it automatically enables the RS485 transmitter when data is to be transmitted. This allows it to support two wire, half duplex communications without any need to control the RS485 transmitter enable from the application program. In short an application program written to support RS232 comms with no flow control can be made to interface to RS485 without modification.

Each of the USB232/485 series of interfaces comes with Windows and Linux compatible drivers and are designed to meet stringent performance requirements and ease of use while maintaining compatibility with standard serial communications boards.

• USB 1.1 specification compliant
• Windows and Linux compatible
• Support for non standard baud rates
• Fast USB to RS232 with data rates up to 1Mbaud
• Fast USB to RS485 with data rates up to 3Mbaud
• FIFO modes supporting a 384 character receive buffer and 128 byte transmit buffers.
• Three point isolated serial communications on isolated versions
• Industry standard panel mounted connectors
• Full Duplex, Half Duplex, Multi-drop applications
• RS485 transmitter enabled automatically in Half Duplex mode
• Full specification signal levels
• Implementation of all RS-232 primary control lines
• Low power consumption

Magic RS485 RS232 Converter

RS485 Magic Manual
	In addition to the standard range of bi-directional RS232 to RS422/485 converters, Amplicon Liveline have introduced two new models. The M485F9 and M485F25 Magic converters, designed by MEV do not require RTS or an external transmit enable signal to control turnaround

Unlike other converters the Magics can convert any RS232 port to RS485 without special software or additional hardware. The transmitter is automatically enabled when the the intelligent converter detects that data is to be transmitted. As with the standard converters it is bi-directional and converts data lines only, handshake lines are looped back internally. Half duplex, two wire RS485 operation is supported.