Black Box IC187C - Manual (Page 14)

13
CHAPTER 3: Card Setup
Table 3-1. Jumper Operation
Name Function
P Adds or removes the 1K-ohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
T Adds or removes the 120-ohm termination.
L Connects the TX+ to RX+ for RS-485 two-wire operation.
L Connects the TX- to RX- for RS-485 two-wire operation.
Figure 3-6. Headers J1A and J2A, which control line termination.
P
P
T
L
L