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When connecting two Model 1010Bs, it is necessary to use a
"cross over" cable. The diagram below shows how a cross over cable
should be constructed for an environment where both Model 1010Bs
use a 6-wire RJ-11 connector. Similar logic should be followed when
using RJ-45 connectors or a combination of the two.
RJ-11 Cable (4-Wire)
SIGNAL
PIN#
GND
†
1-----------------------6
RCV-
2-----------------------4
XMT+
3-----------------------5
XMT-
4-----------------------2
RCV+
5-----------------------3
GND
†
6-----------------------1
Connection to ground is optional.
1
2
3
4
5
6
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your application requires you to connect two pairs of bare wires
to the Model 1010B, you will need to open the case to access the
terminal blocks. The following instructions will tell you how to open the
case, connect the bare wires to the terminal blocks, and fasten the
strain relief collar in place so that the wires will not pull loose.
7
PIN#
SIGNAL
GND
†
XMT-
RCV+
RCV-
XMT+
GND
†
1
2
3
4
5
6
7
8
1.
Open the unit by gently inserting a screw driver between the
DB-25 connector and the lip of the plastic case (see Figure 5,
below). You don't have to worry about breaking the plastic, but
be careful not to bend the D-sub connector.
Once the unit has been opened, you will be able to see the
terminal blocks located at the rear of the PC board.
2.
Remove the insulation from the twisted pairs about one inch
from the end.
3.
Remove the insulation on each of the 2 twisted pair wires
about .25".
4.
Connect one pair of wires to XMT+ and XMT- (transmit
positive and negative) on the terminal block, making careful
note of which color is positive, and which color is negative.
5.
Connect the other pair of wires to RCV+ and RCV- (receive
positive and negative) on the terminal block, again making
careful note of which color is positive, and which color is
negative.
8
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