Rear Card Jumper Settings, Line Shield & FRGND JB2

Interface Combination		Model Number
DB-25	& RJ-11	1000RCM12511
DB-25	& RJ-45	1000RCM12545
RJ-11 & RJ-45		1000RCM1D11
Dual RJ-45		1000RCM1D45

Prior to installation, you will need to examine the rear card you have selected and make sure it is properly configured for your application. Each rear card is configured by setting straps located on the PC board. Section 3.5.1 describes the strap locations and possible settings for each rear card.

3.2.1 REAR CARD JUMPER SETTINGS

Figure 6 (below) shows jumper locations for the four rear card options. These jumpers determine various grounding characteristics for the RS-232 and twisted pair lines.

JB2

(peg 1 on left)

JB3

(peg 1 on top)

JB4

(peg 1 on left)

Figure 6. Rear card jumper locations

Figure 7 (below) shows the orientation of the rear interface card jumpers. The jumper can either be on pegs 1 & 2, or on pegs 2 & 3.

1	2	3	1	2	3	1	2	3
	Figure 7. Orientation of interface card straps

Figure 8 (below) provides an overview of interface jumper functions for the rear interface cards. Following this overview is a detailed description of each jumper’s function.

INTERFACE CARD STRAP SUMMARY TABLE #1

Strap	Function	Position 1&2	Position 2&3

JB2	Line Shield & FRGND	Connected	Open*

JB3	DTE Shield (Pin1) & FRGND	Connected	Open*

JB4	FRGND & SGND	Connected	Open*

Figure 8. Summary of strap settings, * indicates factory default

Line Shield & FRGND (JB2)

This jumper affects the line interface. In the connected (closed) position, it links RJ-11 pins 1 & 6, or RJ-45 pins 2 & 7 to frame ground. These pins can be used as connections for the twisted pair cable shield. In the open (disconnected) position, pins 1 & 6 (or 2 & 7) remain connected to each other, but are “lifted” from the frame ground.

JB2

Position 1&2 = Line Shield and FRGND Connected Position 2&3 = Line Shield and FRGND Not Connected

DTE Shield & FRGND (JB3)

In the connected position, this jumper links DB-25 pin 1 & frame ground. In the open position, pin 1 is “lifted” from frame ground.

JB3

Position 1&2 = DTE Shield (DB-25 Pin 1)

and FRGND Connected

Position 2&3 = DTE Shield (DB-25 Pin 1)

and FRGND Not Connected

SGND & FRGND (JB4)

In the connected position, this jumper links DB-25 pin 7 Signal Ground) and frame ground. In the open position, pin 1 is “lifted” from frame ground.

JB4

Position 1&2 = SGND (DB-25 pin 7) and FRGND Connected

Position 2&3 = SGND (DB-25 pin 7)