Black Box 232/CL-E Manual page 13

RS-232 ↔ CURRENT LOOP INTERFACE CONVERTER
T+
T-
R+
R-
Active
14
T+
T-
R+
R-
Figure 4-3. 4-Wire Point-to-Point.
Figure 4-4. 4-Wire Multipoint.
R+
R-
T+
T-
T+
T-
Passive
R+
R-
T+
T-
Passive
R+
R-
T+
T-
Passive
R+
R-