Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 100)

Chapter
7
1503-UM054C-EN-P – June 2013
Communications
The communications systems implemented within the IntelliVAC
Plus product can be divided into three sections:
1) RS232
2) RS485
3) DeviceNet
RS232 Communications
This interface is used for factory programming of the CPU and is
only to be used by factory authorized personnel.
RS485 Communications
This interface is used for three purposes:
1. For internal communications between the IntelliVAC Base and
IntelliVAC Enhanced boards which are contained within the
IntelliVAC Plus product.
2. For inter-module communications between the IntelliVAC Plus
and the IntelliVAC MC products, to coordinate control actions
amongst up to five medium voltage vacuum contactors.
3. For Flashing the IntelliVAC Base and IntelliVAC Enhanced
boards in an IntelliVAC Plus product or Flashing the IntelliVAC
Base board within an IntelliVAC MC product.
For Item 1 & 2
The communications within the IntelliVAC Plus module, as well as
within the IntelliVAC MC system, operates at a 125K baud rate.
Extensive error checking is provided to prevent incorrect data from
corrupting operation of the entire system. Various error indicators
and DeviceNet parameters are available to indicate that there is an
RS485 communications error present. See Chapter 10 for RS485
Faults/Warnings.
For Item 3
When the RS485 interface is used for Flashing product firmware, the
system operates at a 9600 baud rate. The RS485 interface does not
use any hardware handshaking lines to control bus access or software
handshaking such as XON/XOFF. In this configuration a PC should
be connected to the RS485 port using a shielded cable and an RS232
to RS485 converter such as the Moxa Technologies model TCC-1001.
This adapter also requires the use of an external 24VDC power
supply. See Programming in Chapter 8 for details on Flashing using