13
14
Prior to installation, you will need to examine the rear card you
have selected and make sure it is properly configured for your applica-
tion. Each rear card is configured by setting straps located on the PC
board. To configure the rear cards, you must set the configuration
straps. Figure 5 below shows the orientation of these straps. Each
strap can either be on pegs 1 and 2, or on pegs 2 and 3.
Sections 3.2.1, 3.2.2, and 3.2.3 describe the strap locations and possi-
ble settings for each rear card.
3.2.1 Model 1001RCM12545 & 1001RCM125TB Strap Settings
Figure 6 shows strap locations for the Model 1001RCM125XX (DB-
25) rear cards. These straps determine various grounding characteris-
tics for the terminal interface and twisted pair lines. JB3 and JB4 are
user configurable.
The table below provides an overview of interface strap functions
for the rear interface cards. Following the table overview are detailed
descriptions of each strap’s function.
DTE Shield (DB-25 Pin 1) & FRGND (JB3)
In the connected position, this strap links DB-25 pin 1 & frame
ground. In the open position, pin 1 is disconnected from frame ground.
JB3
Position 1&2 = DTE Shield (Pin 1) and FRGND Connected
Position 2&3 = DTE Shield (Pin 1) and FRGND Not Connected
SGND & FRGND (JB4)
In the connected position, this strap links DB-25 pin 7 (Signal
Ground) and frame ground through a 100 ohm resistor. In the open
position, pin 7 is connected directly to frame ground.
JB4
Position 1&2 = SGND (Pin 7) and FRGND Connected through
a 100 ohm resistor
Position 2&3 = SGND (Pin 7) and FRGND Directly Connected
1 2 3
JB3
JB4
1 2 3
Figure 6. 1001RCM125XX strap locations
1
2
3
1
2
3
1
2
3
Figure 5. Orientation of Interface Card Straps
INTERFACE CARD STRAP SUMMARY TABLE #1
Strap
Function
Position 1&2
Position 2&3
JB3
DTE Shield (Pin1) & FRGND
Connected
Open*
JB4
FRGND & SGND
Connected
Open*
* Indicates default setting
