MKS MF1 - Cable for RS485; Cable for USB; Operation; Address

Chapter 5: Process Interfaces
67
Cable for RS485
RS485 is a balanced communication system, because signal on one wire is ideally the exact
opposite of the signal on the second wire. The maximum length of cable span depends on
environment, cable quality and communication speed, but relative long cable spans up to 1,200m
(4,000 ft.) is possible. There are 2 wires, other than ground, that are used to transmit the digital
RS485 signal. To comply with EN61326-1 immunity requirements, use a braided, shielded cable.
Connect the braid to the metal hoods at both ends of the cable with the end for power supply
connected to earth ground.
Cable for USB
The MF1 with USB process interface supports the full speed USB 2.0 connections. Therefore the
maximum cable length is limited to 5 meters. Standard USB 2.0 cable must be used.
Operation
Address
Defines the device address by the rotary switches. Rotary switch address setting is used as
Interface address/ID, if software address setting is 126. Otherwise the software address setting is
used as Interface address/ID and the rotary switch setting is irrelevant.
Configuration
All Parameters for the communication are defined at the 'Com Interface Object' [ComIfc].
The delivery settings are:
Default settings
Parameter
RS485/USB
Software Address 248
Baud Rate 115200
Parity 0 => none
Data Bits 8
Stop Bits 1
Failsave Timeout 0 (not used)
Config 0 => Human Readable Protocol
Baudrate
Supported Baud Rate