Remote Communication Interfaces; Ethernet (Tcp/Ip) And Snmp Interface (Webcsu); Rs232 Interface (Mcsp); Rs485 Interface (Mcmd) - Rectifier RT9- 24V Installation, Operation And Technical Manual

Installation, Operation and Technical Manual Rectifier Technologies

5. Remote Communication Interfaces

Remote Communications Port is located at the back of MCSU-4. The module is a part of
the controllers' magazine. If a replacement of MCSU-4 is required, there is no need for
disconnection of the communication link. Depending on your monitoring requirements one
of following interfaces can be used.

5.1 Ethernet (TCP/IP) and SNMP Interface (WebCSU)

The Ethernet remote connectivity option is available in both a standard TCP/IP version and an
enhanced WebCSU interface, which includes HTTP, SNTP and SNMP protocols for monitoring via
WinCSU-2, web-browser, and off-the-shelf Network Management Software. See WebCSU manual for
network set-up details

5.2 RS232 Interface (MCSP)

This interface should be used if the distance between the RPS and monitoring PC or a
modem is not greater than 15 meters. The module has standard 9-pin D-type connector.
For connection to a PC a "null modem" (or "cross-over") cable should be used. A modem
should be connected using the cable provided with it.

5.3 RS485 Interface (MCMD)

This type of port allows connection though a distance up to 1200 meters. Up to 32
standard devices can be linked using twisted pair of wires. In high electrical noise
environment a shielded twisted pair is recommended. Figure 5.3-1 below shows the pin
assignment of the port.
Figure 5.3-1 RS485 pin assignments
Due to the slow data rate (9600bps) termination of the line with resistors generally is not
required. However, if high rate of data corruption is experienced (slow data update in
monitoring program), line termination resistors should be installed at both ends of the
network. The value of the resistors depends on the gauge of the twisted pair and should
be equal (or closest) to line characteristic impedance. I.e. twisted pair of 24AWG wires
characteristic impedance of 100ohm – use a 100ohm resistor.

5.4 Integrated Packet Modem (Smart Modem)

This module has full capability of a stand alone modem. It also has an advantage of the
uninterrupted power source available inside the controller. The module connects the
controller directly to the telephone line and breaks the remote data into packets to
enhance error handling particularly over bad quality telephone lines. To enable connection
to the smart modem by WinCSU-2, the remote communication menu options needs to be
set for modem and "Smart Modem" transfer mode (see WinCSU-2 on-line help for details).
158-1872-01 43 19-Feb-14