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Configuring Communication ports
14 • • • • Chapter Three - Getting Started
NOTE: If your host is running on an Ethernet (TCP/IP) platform, see the Ethernet
Users Only note at the end of this section.
The software (Modbus version) supports up to 256 RS-485 ports. The number
actually supported by your hardware depends on your RS-485 interface – see GEH-
6502, POWER LEADER Network Architecture Guide, for details. We refer to these
communication ports as "comm ports" in the documentation.
NOTE: The 256 ports supported by the Modbus version of the PMCS DDE Server
are automatically assigned to logical ports 1 through 256. Other configurations, such
as 3 through 8 are not allowed. It is therefore necessary to disable COM1 and COM2
in the host PC's CMOS setup (typically assigned to RS-232 ports) in order to assign
COM1 and COM2 to RS-485 ports. Do not disable COM1 and COM2 if using an
external RS-232/RS-485 converter box (such as the Multilin interface converter).
For this example, we'll assume that the RS-485 interface is an eight-port RS-485
card. If your situation is different, follow the example and adjust your procedures
accordingly.
Step 1. Click on the Configure pull-down menu and select Configure.
Now you should be looking at the Configuration dialog box, with several options.
DDE Server User's Guide
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