Current Loop Communication Expansion Kit
(For LE-8200A/8200)


Specifications of OP-SB85C
Applicable Analyzer LE-8200A/LE-8200
Measurement Interface Current loop communications (4-pole terminal block)
Measurement signal SD, RD
Baud rate 38.4 Kbps max. *1
Communications test function Monitor, Simulation, BERT
Send/Receive circuit Receive side: Photodiode with reverse connection protection diode *2
Transmission side: Phototransistor with reverse connection protection diode *2
Max. permissible current: 60mA, Max. permissible voltage: 40V
Monitor current level 10 to 60mA (10 to 40mA is recommended.)
Circuit method Passive or active can be selected.*3
Power supply Supplied from built-in constant current source when active circuit is selected.
Selectable current supplies are 20mA or 40mA.*3
Signal polarity Normal (receives when current is on) / inversion (receives when current is off) can be selected *4
Analog waveform analysis The signal voltages of 2 channels are measured and displayed in analog waveform
Sampling: 1 MHz to 40MHz (in 6 steps)
Measurement range: ±6 V/±12 V
Composition Dedicated expansion board, current loop adapter*5, Relay cable [length: 800 mm], 3-wire probe cable
*1: The maximum speed may be limited depending on the cable length and current value. (The maximum speed of the ones shipped before July 2020 is 19.2 kbps)
*2: No current limiting resistor is built-in. When supplying the communication circuit current from an external voltage source, be sure to attach an external resistor so that the maximum permissible current is not exceeded.
*3: Selected by the dip switch of current loop adapter.
*4: Specified by the setting of analyzer.
*5: The current loop adapter and relay cable set "OP-1C" is also sold separately. If you have a OP-SB85L or OP-SB85IR, it becomes an equivalent set in combination with OP-1C.