LEFM 3xxCi User Manual
IB1406 Rev 12
Section 5
Page 33
August 2017
Table 4.6 Ground Connections
Terminal
Description
TB2, Pin 11
Isolated ground for User 1
TB2, Pin 16
Isolated ground for User 1
TB2, Pin 21
Isolated ground for User 2
TB2, Pin 22
Isolated ground for User 2
TB2, Pin 27
Isolated ground for User 2
TB2, Pin 32
Isolated ground for User 2
TB2, Pin 23
Chassis ground
TB2, Pin 24
Chassis ground
Note – Do not connect the isolated grounds to the chassis earth; this defeats the isolation the electronics
provide. Generally, User 1 and User 2 grounds are not connected to each other. These grounds are
intended for separate users. These isolated grounds should be connected as appropriate to the ground
where the signals are going.
Communications
The LEFM transmitter supports remote data communications via its three serial communications ports and
Ethernet communications (RJ45 or fiber modem). Figure 4.10 shows the locations of the RJ45 (copper) and
the MT-RJ (Fiber) connections on the IOP board. Note that the Ethernet connection is electrically isolated
from both User groups (e.g., independently isolated).
