19
SGND & FRGND (JB4).
In the connected position, this strap links DB-15
pin 8 (Signal Ground) and frame ground through a 100 ohm resistor. In
the open position, pin 8 is connected directly to frame ground
(see Table 17).
Model 1001RCM11575 Strap Settings
Figure 10 shows strap locations for the Model 1001RCM11575 (DB-15/
Dual BNC) rear cards. Figure 8 shows strap locations for the Model
1001RCM11548C (DB-15) rear cards. These straps determine various
grounding characteristics for the terminal interface and twisted pair lines.
JB3 and JB4 are user configurable.
Figure 10.
1001RCM11575 strap locations.
Table 17:
JB4 strap settings
Position
Description
1 & 2
SGND (Pin 8) and FRGND Connected through a 100 ohm resistor
2 & 3
SGND (Pin 8) and FRGND Directly Connected
JB3
1
3
JB4
1
3