Creating A Modbus Link With The Pac - ICP DAS USA VP-2117 Getting Started

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3.15 Creating a Modbus Link with the PAC

Please refer to CD-ROM: \napdos\isagraf\8000\english_manu\
user_manual_i_8xx7.pdf
For detailed ISaGRAF User‟s Manual. It is listed in Chapter 8.
If the COM2/3: RS-485 Port is used for Modbus Master, one VP-2117 can connect
to many other devices. Each device on the link must have a unique NET ID (1 ~ 255)
address, and communicate at same baud rate settings.
If COM1 : RS-232 is used, you can only link one VP-2117 to ONE other Modbus
device. To use the COM1 as Modbus Master Port, please disable the default
Modbus RTU Slave setting in it. Please refer to Section 3.5.
If the COM3 : RS-232 Port of the PAC is used to connect to one I-7520R (RS-232/
RS-485 converter), then the PAC can network to numerous Modbus devices.
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VP-2117 Getting Started, Apr. 2010, V1.0