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MODULAR CURRENT LOOP ADAPTER
3.2 Current-Loop Interface
Review the following pinning guidelines before you connect the twisted-pair cable
from your current-loop device to the adapter's RJ-11 port or four-position screw
terminal. Figure 3-1 shows the pin positions for both connectors.
RX+
TX-
TX+
RX-
TX+
TX-
RX+
RX-
1 2 3 4
1 2 3 4
Figure 3-1. Pin Positions for RJ-11 and Terminal Screw Block.
Connections on the current-loop side of the adapter may be full- or half-duplex. In
full-duplex transmission, both the adapter and the current-loop device may send
and receive data simultaneously. In half-duplex transmission, only one device at a
time may send or receive data. Section 3.2.1 describes full-duplex connections and
Section 3.2.2 discusses half-duplex connections.
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