Radio Power
In order to provide maximum flexibility for the user the PCFW-104 allows for powering of the
Radio Module from either the PC/104 Bus 12 VDC supply or an external 6-30 VDC source.
PC/104 Bus Power
Place jumper JP2 in the INT position (jumper nearest PC/104 Connector).
The radio module is now powered from the PC/104 bus an no further connections are re-
quired. It is important to be sure that the 12 VDC bus power source has sufficient current to
supply the radio. It is recommended that the supply have at least 1.0 Amp capacity.
External Power
Place jumper JP3 in the EXT position (jumper farthest from PC/104 Connector). The radio
power now comes from terminal block J4. Note polarity! The positive terminal is marked with
a + and is the terminal farthest from the PC/104 Connector. Be sure to tighten the terminals
snugly.
The radio can be powered from any 6-30 VDC source such as vehicle power as long as the
source is capable of at least 1 Amp.
Caution
Observe polarity when powering radio from external power!
When using external power sources for the radio modem it is essential that the external
radio power and PC/104 stack be switched at the same time as described earlier in this
manual. It is recommended that if vehicle power is used the radio and PC/104 stack be
switched from the same master power switch. Powering the radio and not the stack could
potentially damage either the radio or the stack. Similarly, powering the stack and not the
radio can also potentially cause damage.
OVERVIEW
...............................................................................................................
The PCFW-104-ETH is based on the Realtek RTL8019AS Ethernet controller with Plug and
Play functionality. The RTL8019AS integrates the RTL8019 Ethernet controller core and 16
Kbyte SRAM in a single chip. A serial EEPROM is used to store resource configurations and ID
parameters. This is mated with a ASIC Ethernet to Serial bridge. Operation of the bridge is
transparent to the user and once the radio and Ethernet adapter are configured operation is
identical with a standard LAN port.
REALTEK RTL8019AS Ethernet Controller
The Realtek RTL8019AS is a highly integrated Ethernet controller that is used on the PCFW-
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Summary of Contents for PCFW-104-ETH
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