17
RS-232
↔
CURRENT LOOP INTERFACE CONVERTER
4.3
Switch SWA
Switch SWA controls the Current Loop Configuration. The CL050 is shipped with
the SWA in a “Full-Duplex, Passive” configuration.
Note: 0 indicates “OPEN” and 1 indicates “CLOSED.”
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10
Loop Configuration
0
1
0
1
0
0
1
0
1
0
Full-Duplex, Passive
1
0
1
0
1
1
0
1
0
1
Full-Duplex, Active
0
1
0
1
0
1
0
1
0
1
Full-Duplex, Passive
Receive/Active Transmit
1
0
1
0
1
0
1
0
1
0
Full-Duplex, Active
Receive/Passive Transmit
0
1
0
1
0
0
1
0
1
0
Half-Duplex, Passive
(2-wire operation)
0
1
0
0
1
1
1
0
1
0
Half-Duplex, Active
(2-wire operation)
4.4
Switch SWB
Switch SWB controls loop current (20/30/60 mA). The CL050 is shipped with the
SWB in a “20mA receive; 20mA transmit” configuration.
Note: 0 indicates “OPEN” and 1 indicates “CLOSED.”
SW1
SW2
SW3
SW4
Loop Current
0
0
0
0
20mA receive; 20mA transmit loops
1
1
1
1
60mA receive; 60mA transmit loops
1
1
0
0
60mA receive; 20mA transmit loops
0
0
1
1
20mA receive; 60mA transmit loops
1
0
1
0
30mA receive; 30mA transmit loops