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Rcv; Xmt - Patton electronics 2089 User Manual

Ultra-miniature, db-9 eia/tia-574 to rs-485 interface converter

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3. Strip the insulation on each of the twisted pair wires about .25".
4. In a two pair circuit, 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.
Ultimately, you will want to construct a two pair crossover cable that
makes a connection with the two Model 2089s as shown below.
XMT+--------------------------------------------------RCV+
XMT----------------------------------------------------RCV-
G ----------------------
RCV+--------------------------------------------------XMT+
RCV----------------------------------------------------XMT-
6. In a single pair circuit, use only the transmit (XMT) pair as
shown below:
XMT+--------------------------------------------------XMT+
XMT----------------------------------------------------XMT-
Note: If there is a shield around the telephone cable, it may be
connected to "G" on the terminal block. To avoid ground loops, we
recommend connecting the shield at the computer end only. A ground
wire is not necessary for proper operation of the Model 2089.
To Shield (Optional)
(Continued)
10
}
One Pair
G
}
One Pair

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