Black Box Async 232 422/530 Manual page 13

ASYNC 232↔422/530 CARD
Jumper
JB2
JB4
JB5
JB6
JB7
*Indicates factory default
Line Shield (JB2 and JB4)
This jumper pertains to the line interface. In the connected position, the
jumper links RJ-11 pins 1 and 6 to frame ground and the rear panel. These
pins can be used as connections for the twisted-pair cable shield. In position
2 and 3, pins 1 and 6 (or RJ-45 pins 2 and 7) are disconnected from frame
ground.
Position 1 & 2 = Line Shield A and B Connected to Frame Ground
Position 2 & 3 = No Shield
15
Table 3-1. Summary of jumper settings
Interface Card Jumper Summary
Function
Line A Shield
Line B Shield
SGND & FRGND
DTE A DSR*
DTE B DSR*
JB2 and JB4
Position 1 & 2 Position 2 & 3
Connected
Connected
Connected
Connected
Connected
No Shield*
No Shield*
Open*
N/A
N/A