Full-Duplex Operation - Black Box CL512A-F User Manual

MODULAR CURRENT LOOP ADAPTER
3.2.1 F -D
ULL UPLEX
Table 3-1. Pinouts for Full-Duplex Current-Loop Connections
Typical full-duplex applications for the adapter are shown in Figures 3-2 and 3-3. In
Figure 3-2, the unit is connected to a DTE device. In Figure 3-3, the unit is
connected to a DCE device.
When connected to a DTE device, the adapter does not output pins 5
(CTS), 6 (DSR), or 8 (CD). If your computer (DTE) needs these pins
before it can send data, you must use a short cable with the proper pin
configuration between the computer and the unit. This entails looping
pin 4 (RTS) or any other signal at 12 volts to pins 5, 6, and 8 on the side
connected to the computer.
When connected to a DCE device, the adapter does not output pins 4
(RTS) or 20 (DTR), which your modem may need before it can send data.
If your modem needs these pins, you must use a short cable with the
proper pin configuration between the modem and the unit. This involves
looping pin 8 (CD) or any other signal on the interface that is at +12 V to
pins 4 and 20 on the side connected to the modem.
8
O
PERATION
RJ-11 Modular Pinnings:
1 = RX+, connect to the TX+ of your device.
2 = TX-, connect to the RX- of your device.
3 = TX+, connect to the RX+of your device.
4 = RX-, connect to the TX- of your device.
Terminal Block Pinnings:
1 = TX+, connect to the RX+ of your device.
2 = TX-, connect to the RX- of your device.
3 = RX+, connect to the TX+ of your device.
4 = RX-, connect to the TX- of your device.
NOTE