RLE Protocol Converter V.2.4 - Manual (Page 16)

16 Protocol Converter User Guide 800.518.1519
2 Installation
2.3. Wire the Protocol Converter
If you plan to use the EIA-485 port for Modbus RTU communication, RLE Technologies
recommends an 18 AWG shielded, twisted-pair stranded copper wire for the connection. RLE
recommends no more than 2,000 feet (609.6m) of wire at this specification. If longer runs are
needed, contact RLE Technologies for application guidance.
2.3.1 Power Supply & Ground Connections
To provide power and ground connections to the Protocol Converter:
1 Connect an 18 AWG ground wire from the ground terminal to a suitable earth ground.
2 Connect power to the Protocol Converter in one of two ways, as shown in Figure 2.2 :
a Plug the wall adapter (provided) into the power jack on the Protocol Converter and into a
UPS outlet.
b Connect a dedicated 24VDC power supply to the + and - terminals to the left of the
power jack.
IMPORTANT RLE Technologies recommends powering the Protocol Converter from a UPS (uninterruptible
power supply) so the Protocol Converter can send alarm notifications during a power outage.
Figure 2.2 24VDC Power Supply Connection