Connection using DCOM
Using DCOM can be difficult at first time, try to read some articles (see some suggestions below) about DCOM at microsoft, and install DCOM95 (if you are using win95) NetClip (Simple Clipboard DCOM application) and OLE-COM Object Viewer.
Here are some Articles about DCOM, use the search engine at microsoft site.
FAQ: DCOM95 Frequently Asked Questions Article ID:Q174024
HOWTO: Use Win95 as a DCOM Server Article ID: Q165101
COM Security Frequently Asked Questions Article ID:Q158508
HOWTO: Control Server Location in a Visual Basic Client Article ID: Q180217
The OLE-COM Object Viewer
This Modbus server and client application were tested only with win95 using 2 machines (one connected with a modbus slave using serial port and reading registers from the other machine) with TCP/IP protocol installed. The steps used during installation are the following:
Run Modbus Configuration (Modbucfg.exe) on the client machine an create a connection using the serial port which the slave is connected, but now type the IP Address of the machine where the server is running in DCOM|Server text box.. This means that the program will create an instace of the server on the other machine. Note that you can change the serial port parameters ( baudrate , parity... ) from the client machine.
Fig 1. Creating an instance of Modbus Server on another machine
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