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As a policy of continual improvement, RMF reserves the right to alter the specification without prior notice.
201.028 REV 1
Date of Issue: 18 June 2018
6.1.2.3 Machine Connector - Serial Interface
An RS485 or CANbus interface can optionally be connected to pins 1 and 3 (yellow and green). This can be PLC
running customer software, or a PC with a RS485 adaptor running the supplied RMF-View software. To provide a
reference the RS485 0V connection should also be linked to the CMS 0V (as shown on figure 6.3).
The standard CMS control protocol is Modbus RTU. Modbus is a freely available open standard for industrial
control. Adapters are available to interface to other industrial control busses. The standard RMF-View software
from RMF Systems itself uses Modbus to communicate with the CMS, but it is also possible for customers to
implement their own controllers (section Modbus).
The CANbus protocol can also be used; see the CANbus section later in the manual.
Figure 6.3a PC Control Example
Figure 6.3b Modbus Controller Example
Figure 6.3a shows a single CMS linked to a PC, using a USB-RS485 adaptor. Figure 6.3b shows a slightly different
method. 100 Ohm termination resistors should be fitted as shown for long cables, for example over 10m. Twisted
pair wiring should be used for any length over 2m.
Содержание CMS 2
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