SATEC PM135 Manual - Manual (Page 30)

‎Chapter 2 Installation I/O Connections
30 PM135 Powermeter Series
2.5 I/O Connections
Before I/O Module installation ensure that all incoming
power sources are shut OFF. Failure to observe this practice
can result in serious or even fatal injury and damage to
equipment.
Figure ‎2-17 Module Connector Cover – Before Module Assembly
For I/O ratings, see Technical Specifications in Appendix A.
4DI/2DO Module
Figure ‎2-18 4DI/2DO Module Assembly
Relay Outputs
There are two relay outputs provided for energy pulsing, alarms, or
remote control.
Module connector cover
RS-485 Terminals
Remove Module Connector cover
before assembling module