GW Instek APS-1102 User Manual - Manual (Page 19)

1.4 List of Functions
APS-1102 Programmable AC/DC Power Source 1-5
Table 1-2. List of Functions (2/2)
Function Description
External
control
External control I/O
External control operation modes: Enable, disable
Control input:
Input level: High level: +4.0 V or higher
Low level: +1.0 V or lower
Non-destructive max. input: +10 V/ 5 V
Input impedance: Pulled up to +5 V with 47 k 
Control items: Output on/off, sequence
start/stop, hold, branch
Status output:
Output level: 0/+5 V (open)
Output impedance: 100

Status items: Power on/off, output on/off, limiter
operation, software busy, sequence
operation step sync output
Terminal: D-sub 25-pin multiterminal
USB interface Standard equipped