Connecting The Current-Loop Device - Black Box CL512A-F User Manual

2
3
6
7
MODEM
(DCE)
COMPUTER
(DTE)
3.2.3 C
ONNECTING THE
If you're using the RJ-11 port on the adapter, simply plug the cable from the
current-loop device into the RJ-11 port.
If you're using the screw terminal, wrap one of the 2- or 4-wire twisted pairs from
the current-loop device around each of the screw terminals.
HALF-DUPLEX (2-WIRE)
CL512
1 TX+
2
3
4 RX-
DCE DTE
Figure 3-4. Half-Duplex DTE Operation.
HALF-DUPLEX (2-WIRE)
CL512
2 1 TX+
3 2
7 3
20 4 RX-
DCE DTE
Figure 3-5. Half-Duplex DCE Operation.
C -L
URRENT OOP
MODULAR CURRENT LOOP ADAPTER
RX+
TX-
(ACTIVE CURRENT LOOP DEVICE)
RX+
TX-
D
EVICE
ASYNC COMPUTER
ASYNC COMPUTER
(ACTIVE CURRENT LOOP DEVICE)
11