Blackbox PI320A-R3, Manual, Page: 11 / 22

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CHAPTER 3: Installation
J4—Four-Position Terminal Block
Input Device Output Device Receive
Position Function (S2-5 UP) (S2-5 DOWN)
1 Pair 2+ T
2 Pair 1+ T
3 Pair 1- Transmit- Receive-
4 Pair 2- Receive- Transmit-
NOTE
When connecting an input-configured device to an output-configured
device, the interconnecting cable should be straight-through (position 1
to position 1, position 2 to position 2, etc.). This is true for both the J3
(RJ-11) and the J4 (4-position terminal block) connectors.
3.1.2 S
WITCHES
S1: 2-Position Slide Switch
See the description of J2.
Position Function
A Configure as DCE for connection to PC serial port.
B Configure as DTE to simulate PC serial-port output.