Communications Document

27Morningstar Product Connectivity Manual

NOTE: A NULL modem cable is used to connect the PC to

the RSC-1 adapter.

Once connected, please refer to Section 5 on how to make Local Connections in MSView

4.2.7 Multiple Device Using USB / RS-232

Multiple devices can be connected to a PC at the same time through the use of a USB / RS-232

network. The USB hub expands the PC’s number of USB ports, allowing for more Morningstar

devices to be connected to the computer. As with a single USB / RS-232 connection, an adapter

cable is needed for each device to be connected to the hub. Each USB / Serial cable is mapped

to a different VCOM port. In this type of network, the PC communicates with one device at a time

and the devices do not have the ability to communicate with each other. Figure 28 below illus-

trates the correct way to establish a multiple device connection via a USB hub.

Figure 27. Multiple Device USB / RS-232 Connection Diagram

NOTE: USB cables can be no longer than 5 meters or you

risk signal loss.

To communicate properly with each controller, you will need to specify a unique MODBUS

address for each unit. To do this, you must connect to each controller individually and use the ap-

propriate MSView

setup wizard to assign an address.

Once connected, please refer to Section 5 on how to make Local Connections in MSView