User Guide
e GC-100 Discovery and Conguration Utility is
available for download from the support section on
our website (www.globalcache.com). Once installed,
the application will listen for the GC-100 on the
network and display it in a list. It may take up to 60
seconds for the all GC-100s on the network to be
listed. Conguration settings can ve view and edited
by highlighting a GC-100 in the list and pressing the
Congure button.
Power is supplied by an AC wall adapter rated for 9V
to 18V DC@300mA. Shortly after applying power all
the IR indicators will momentarily turn on then o
signifying completion of the self-test. e GC-100 is
ready for operation after the power (PWR) indicator
is on.
LAN connection is used for all communication over
the network and for conguring the GC-100. e
GC-100 is set to support DHCP by default. To locate
the GC-100 on the network and determine its IP
address, download and install the GC-100 Discovery
& Conguration Utility from www.globalcache.com.
Once installed, the utility provides a list of GC-100s
on the network and allows the user to change the
settings of those found.
In most network environments, the GC-100 can also
be accessed by name. e network name of a GC-100 is
“GC100_XXXXXXXXXXXX_GlobalCache” where
the Xs are the 12 character MAC address printed on
the bottom of the GC-100. For example, if the MAC
address was “000C1E012345” then the GC-100
network name would be “GC100_000C1E012345_
GlobalCache.”
If using a crossover cable connected directly to a
computer, or if a DHCP server is not available, the GC-
100 will use the default IP address of 192.168.1.70.
e PC must also be on the same network with an
address such as 192.168.1.102. e “LINK” indicator
on the LAN connector will light when the cable is
plugged in properly. After establishing a link, the
GC-100’s web pages are accessible from a browser by
entering its IP address.
A suitable static IP address can also be entered for your
network environment, making sure the GC-100’s IP
address is outside the network’s DHCP partition, if
DHCP is used. In addition the default gate way address
and subnet mask will need to be set before installing
the GC-100. Once the GC-100 is on your network,
further conguration can be accomplished through the
new IP address.
Except for serial, all data commands are sent over TCP/
IP Port 4998. is includes infrared, sensor, and relay
commands. Each serial connection has a unique port
number for communication, starting with Port 4999
for serial connector 1, Port 5000 for serial connector
2, and so on.
Factory defaults can be set during power up by
connecting pins 7 and 2 on connector SERIAL 1 with
a wrap back connector or a at bladed screw driver.
(Refer to the Serial DB9 Connector diagram for pin
locations.) IR indicator 1 will blink on, then all the IR
indicator lights will blink on, then all of them will go
o. is indicates the GC-100 has been set to factory
defaults, including Conguration Lock, which defaults
to disabled.
Web pages are used to congure the GC-100 for proper
operation in a particular environment. Parameters are
selected by pull down menus and put into eect after
executing “Apply.” e GC-100 resets, blinking all
indicators on then o, to complete the update.
Serial communication utilizes a male (9 pin) DB9
connector with active signals on the pins shown in the
diagram. Unfortunately, serial standards are
not always adhered to, and special attention must
be given when connecting serial cables. For proper
serial communication cable conguration, baud rate
(communication speed) parity, and ow control must
be correct. At a minimum, to send and receive serial
data TxD, RxD, and Gnd must be connected to the
other serial device. ese signal locations will depend
on the mating connector’s type and gender. Typically,
communications can be established by a trial and
error method of swapping the TxD and RxD
lines. Incorrect wiring will not harm serial drivers.
Also, ow control must be disabled or asserted for
communications to start. If erroneous characters are
transmitted, it is usually an indication of an incorrect
baud rate setting.
ere are two types of ow control: RTS/CTS for
data ow and DTR/DSR for modem control. e
GC-100 does not use modem ow control and will
always assert the DTR line and ignore DSR. When
data ow control is used, the GC-100 will stop
its transmission when its CTS signal is asserted by
the other device. When receiving data the GC-100
may assert RTS to signal the other device to stop
its transmission. In a typical control environment,
serial devices usually communicate with short and
infrequent commands. Hence, some serial devices
may not have ow control signals. is is usually not
a concern, since a serial input buer is much larger
(256 bytes) than the transmitted data commands.
In these cases, the GC-100 ow control should be
disabled. However, to avoid potential character loss,
it is a good rule to use ow control when it is available
on serial devices. e GC-100 performs ow control
by asserting RTS when the input buer goes beyond
192 bytes, and de-asserting RTS when it falls below
64 bytes. In either case, the GC-100 records all
serial buer overows and maintains a count on the
Network web page.