Chapter 2 Installation of OEM7 Family Receiver Cards
OEM7 Installation and Operation User Manual v4
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information.
When a USB port is set to Device mode, it is used to communicate between components in the
GNSS system and to external data communications equipment such as computers and data log-
gers.
When the USB port is set to Host mode, it supports USB mass storage devices, such USB
memory sticks.
For information about the USB memory sticks supported by OEM7 receivers, see
Multiple USB Ports
OEM7 receivers with a 60 pin interface connector (such as the OEM7700) have two USB ports,
one configured as a device and one configured as a host.
The state of the USB Port Mode Select pin (pin 51) determines which USB port is configured as
host.
USB Port Mode
Select Pin (UID) State
USB0 Mode
USB1 Mode
Tied Low
Host
Device
Tied High
Left Unconnected
Device
Host
Table 6: USB Port Mode
USB0 is the recommended interface if only one of the USB ports is used, as USB0 provides a con-
nection for VBUS.
USB OTG is not supported. The state of the USB Port Mode Select pin is sampled when the
receiver starts and the USB mode of both ports is set at that time.
2.11.3 Ethernet Ports
OEM7 receivers have a 10Base-T/100Base-TX Ethernet port for communications with external
data communications equipment such as computers and data loggers. The Ethernet port sup-
ports IPv4 Internet layer, TCP/IP transport and telnet. Users can conduct remote debugging,
accept MRTCA (modified RTCA) data and download firmware. OEM7 receivers are also equipped
with NTRIP Version 2.0 (Networked Transport of RTCM via Internet Protocol) client and server
capability.
The OEM7 receiver cards do not have Ethernet magnetics or an RJ45 connector. If
using the OEM7 Ethernet connectivity, the distance between the OEM7 receiver and
the magnetics must be no more than 10 inches (25.4 cm), and the distance
between the magnetics and the jack must be no more than 1.5 inches (3.8 cm).
The OEM7 uses the Texas Instruments TKL106 Ethernet PHY. Follow Texas
Instruments’ recommendations for transformer selection.
