User Manual

MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 13
4.5 Grounding Considerations
To minimize the chance of damage to the transceiver and connected
equipment, a safety ground (NEC Class 2 compliant) is recommended
which bonds the antenna system, transceiver, power supply, and con-
nected data equipment to a single-point ground, keeping all ground leads
as short as possible.
Normally, the transceiver is adequately grounded if the supplied flat
mounting brackets are used to mount the radio to a well-grounded metal
surface. If the transceiver is not mounted to a grounded surface, it is rec-
ommended that a safety ground wire be attached to one of the mounting
brackets or a screw on the transceiver’s case.
The use of a lightning protector is recommended where the antenna
cable enters the building. Bond the protector to the tower ground, if pos-
sible.
4.6 COM1 (Management) Connections
The radio’s COM1 port is used to connect a PC for management or diag-
nostic purposes. Typically, a straight-through DB-9 cable can be used
for this purpose. If desired, construct a cable as shown in Figure 13, con-
necting Pins 2 (RXD), 3 (TXD), and 5 (GND).
Other custom cables or adapter kits are only needed for analog operation
or other special-use applications.
NOTE: To prevent unintended keying of the transmitter during management
activities, set PTTSIG to OFF , or do not connect to Pin 6 of the
COM1 port.
Figure 12. COM1 Connector (DB-9F)
As viewed from outside the radio
5
9 6
1