Meter Engineers Handbook for Cellular Communication 20
7.1 Digi TransPort WR21
Two screw holes are on the bottom to mount the Digi TransPort WR21. Digi separately sells a bracket (Part number
76000775) that fits over the Digi TransPort WR21 and has “ears” or tabs that make it easier to mount. Note that to
install this bracket the four rubber “feet” must be removed. They are easily pried off with a flathead screw driver.
Digi also has a SIM cover (part number 76000787) that prevents anyone from removing the SIM card.
Dimensions of the Digi TransPort WR21 are 100mm x 131mm x 32mm (L x W x H). Note that you should choose an
enclosure that allows enough room to connect the power connector, Ethernet cables (and/or the serial cable), and
the antennas (or SMA RF connector on a pigtail coax cable to a bulkhead connector if you are going to use antennas
external to the enclosure).
Power for the Digi TransPort WR21 can come from any 9-30V DC power supply capable of sourcing 1.5 amps. In
extreme high temperature environments you should choose a power supply that can source a higher current do
to the typical de-rating of most power supplies. There are two types of connectors that come on a Digi TransPort
WR21 depending on which model you order. There is a 2.1mm locking barrel connector type and a more industrial
Phoenix connector that has screw down leads. Digi can supply high temperature power supplies for either option.
Part number 76000752 for the barrel type and 76000736 with bare leads that can be used with the Phoenix
connector type.
Bottom view of a Digi TransPort WR21.
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