HMC Electronics MDL Series BK Precision DC Electronic Load System Module - Manual (Page 35)

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External ON/OFF Control Connection
ON/OFF IN (pin 3 of rear 8-pin Control Connector) is used to toggle the multi-channel electronic
load inputs ON or OFF. When ON/OFF IN pin receives a TTL level pulse (>10us), the ON/OFF state
of the load will toggle. SYNC ON SET function can be set to ON for multiple channels to toggle more
than one channel at a time.
ON/OFF OUT (pin 4 of rear 8-pin Control Connector) indicates ON/OFF state of the multi-channel
electronic load. If SYNC ON SET function of any specific channel is set to ON and the channel’s
input state is ON, pin 4 outputs a low TTL level signal. If the input state is off, pin 4 outputs a high
TTL level signal.
Mainframe Extension Connection
Figure 15 – Mainframe Extension Connection
This interface is used to connect the mainframe extension to expand the number of channels. Up
to 16 total channels can be supported when mainframe is connected to the mainframe extension.
Procedure:
1.
Use expansion cable to connect the mainframe extension interface between the mainframe
and mainframe extension.
2.
Press Shift + ⑦ to enter System menu. Use  keys to navigate through menu.
3.
Select <Expand module> and choose ON to enable expand function.
4.
Press Enter to confirm.
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440