Connecting Pc To Vp-2117"S Com2; Connecting Pc To Several Vp-2117"S Com2 - ICP DAS USA VP-2117 Getting Started

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3.3 Connecting PC to VP-2117's COM2
If your PC is connecting to a VP-2117 COM2 Port (RS-485), the maximum distance
between the I-7520R (the RS-232/RS-485 converter) and the VP-2117 PAC is up to
1,200 meters (4,000 feet). The distance between these two is dependent on the
baud rate; the rule to follow is the lower you set the baud rate, the longer the
distance can be.
3.4 Connecting PC to Several VP-2117's COM2
An additional feature of using the COM2 Port of the VP-2117 is that you can
configure an RS-485 network from one PC to link to numerous VP-2117 PACs. The
PC can download ISaGRAF applications to each PAC on the RS-485 network. The
maximum number of PACs that can be networked via the RS-485 network is 255
(Not recommended to use so many).
To create an RS-485 network you must first insure that each VP-2117 PAC has a
unique NET-ID address, and each of the COM2 on PACs link the D+ to the D+
signal and the D- to the D- signal.
It is recommended to add two terminal resistors (try 220, then 110, and then
330 if the RS-485 communication is not stable) on the nearest VP-2117 and
farthest VP-2117 for long distance RS-485 connection.
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VP-2117 Getting Started, Apr. 2010, V1.0