Specifications

Chapter 4 4-Wire E&M/TO Configuration
4-5
Figure 5-3. E&M Signaling Types 1, 2, 4, and 5
PROGRAMMING E&M SIGNALING TYPES
Jumper Switch Settings
E&M signaling types I, II, IV and V (see Figure 5-3) are configured by jumpers J1, J2 and J3 located on
each channel. Because the signaling types are configured on an individual channel basis, different E&M
types may be mixed on the same card. The entire card, however, must operate in either Normal or
Tandem mode, which is determined by the signaling cable used (see the Cabling section below). The
following table (which is also printed on the 4-wire E&M back plate) shows the proper jumper
connections for each signaling type and mode.
Table 5-2. Jumper Connections By Type and Mode
E&M
Type
Mode Jumper Placement
J1 J2 J3
1 Normal 3-4 5 8-9
1 Tandem 1-2 5 10-11
2 Normal 3-4 6 7-8
2 Tandem 1-2 6 7-8
4 Normal 1-2 6 7-8
4 Tandem 1-2 6 7-8
5 Normal 1-2 5 8-9
5 Tandem 1-2 5 8-9
The jumpers are blocks that make several connections simultaneously. The entire block is moved between
the positions indicated above. This makes programming easier by changing several connections with one
move. The jumper pins are on 0.1”x0.2” centers, making it impossible for the user to accidentally turn the
jumper 90 ° and insert, shorting -48V to ground.
Figure 5-4 shows the jumpers as they appear on the 4-wire E&M/TO card. The programming positions
listed in the table above are marked in bold for each jumper. In this illustration, the blocks are shown set
for “E&M Type 1 Normal” with jumper J1 connected in position 3-4, jumper J2 in position 5, and jumper
J3 in position 8-9. Solid lines represent connections made by the jumpers in the positions indicated, while
the dashed lines represent open connections.