3 connecting to the vp-16x18ak via rs-232, 4 connecting to the vp-16x18ak via rs-485, Connecting to the vp-16x18ak via rs-232 – Kramer Electronics VP-16x18AK User Manual
Page 19: Connecting to the vp-16x18ak via rs-485, Figure 5: connecting to an unbalanced acceptor, Section
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