ABB UNITROL 1020 - Communication Ports

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 33
3.3.8.2 Forcing Analog Outputs
Analog outputs can be forced to a certain level by selecting the min and max voltage
level to the same value.
3.3.9 Communication Ports
UN1020 has three main communication ports to share several features that can be used
in combination to cover the requirements of an application.
 USB is a point-to-point interface that can be used to connect the UNITROL 1020
with a PC and is used by the CMT1000 software to control the device.
 The Ethernet port is used to connect the UNITROL 1020 to a multiple point
Ethernet network in order to connect the CMT1000 remotely and to access the
UNITROL 1020 by a plant control system in parallel.
 RS-485 is a multi-point interface that could be used for Remote Access (Modbus
RTU) or VDC; only one feature can be used at the same time.
 CAN is a multi-point interface used to connect a UN1000-PM40 module and uses
the Double Channel feature for setpoint follow-up of the second channel. Only one
of the above features can be used at same time.
This section describes the hardware and wiring requirements for the communication
interfaces. The software features that use these communication interfaces are explained
in Chapter 3.4 Software.
3.3.9.1 USB Interface
The serial USB port of UN1020 can be used to connect a PC that runs a CMT1000
software. Max. USB cable length is 3 m. The USB port will power up control devices of
UNITROL 1020 in order to allow the user to download or upload files to the unit without
additional power supply connection.
Figure 3-2 USB connection to a PC
NOTICE!
Use only the USB cable that is supplied with the device. Using
another cable might cause communication failure or power over
USB might not work correctly so that the device does not start.