Black Box 2-Port RS-232/422/485 User Manual page 12

CHAPTER 3: Card Setup
Examples on the following pages describe all of the valid settings for J1B
and J2B.
Interface Mode Examples J1D – J4D
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Figure 3-1. Headers J1B and J2B set for RS-422.
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Figure 3-2. Headers J1B and J2B set for RS-485 "Auto" with "No Echo."
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Figure 3-3. Headers J1B and J2B set for RS-485 "Auto" with "Echo."
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