JP3: 2-Wire/4-Wire Mode Selection
The setting for jumper JP3 determines whether the Model 1045RC
is operating in 2-wire or 4-wire mode. Be careful not to lose the jumper!
JP3
Setting
Jumper on pins 1 & 2
2-wire (half duplex only)*
Jumper on pins 2 & 3
4-wire (full or half duplex)
Jumper removed
Not a valid setting
*Note: in 2-wire mode, the Carrier Control Method switch must be set to
“RTS Control” (S1-7 = On)
3.1.4 REVERSIBLE “DAUGHTER BOARD”
The Model 1045RC supports both RS-232 and V.35 electrical
interfaces for the terminal connection port. Which electrical interface is
active is determined by the orientation of the small reversible daughter
board on the front card (see Figure 4, below). The daughter board is
clearly marked “This side up for RS-232” and “This side up for
V.35”. Note: When plugging the daughter board into the socket, the
arrow should always point toward the front of the PC board.
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3.2 REAR CARD CONFIGURATION
The Model 1045RC has four rear interface card options: DB-25 &
RJ-11, DB-25 & RJ-45, M/34 & RJ-11 and M/34 & RJ-45 (see Figure 5,
below). Each of these options supports one terminal connection and
one line connection.
Each of the four rear card options for the Model 1045RC has a
distinct model number. The four options and their model numbers are
shown below:
Interface Combination
Model Number
DB-25 & RJ-11
1000RCM12511
DB-25 & RJ-45
1000RCM12545
M/34 & RJ-11
1000RCM13411
M/34 & RJ-45
1000RCM13445
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.
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FRONT THIS SIDE UP FOR RS-232
Figure 4. Terminal interface selection “daughter board”
RJ-11 (6-wire)
RJ-45 (8-wire)
Figure 5. Model 1045RC interface card options
DB-25 F
DB-25 F
RJ-11 (6-wire)
RJ-45 (8-wire)
M/34 F
M/34 F
