Pro-face GP-3500L - Multilink Connection

For GP-4501T/TW
RS-422/485 (plug)
4.4 Multilink Connection
For the communication drivers that support serial multi-link, see [Which drivers
support serial multilink communication?]
(http://www.pro-face.com/otasuke/files/manual/gpproex/new/device/com_mlnk.ht
m).
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