Toho Electronics TRM20A Operation Manual page 135

•DI input：
Dry contact input (9 points), Common terminal is shared.
Ratings：Photo-coupler drive 12V DC about 3mA/1 point
The following control is possible according to the contact input.(ON/OFF pulse time
over 0.5 sec)
Start/stop of main and sub record operation
①
Message setting
②
Multiplication value reset
③
LCD backlight ON/OFF control
④
•DO output ：
Open collector output (12 points), Common terminal is shared.
Point of contact ratings：30V DC 20mA/1 point
It is possible to specify it for an alarm output. It can be specified as special internal relay output.
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