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6 • Chapter 4 Communication DMC-2X00
Although UDP/IP is more efficient and simple, Galil recommends using the TCP/IP protocol. TCP/IP
insures that if a packet is lost or destroyed while in transit, it will be resent.
Ethernet communication transfers information in ‘packets’. The packets must be limited to 470 data
bytes or less. Larger packets could cause the controller to lose communication.
NOTE: In order not to lose information in transit, Galil recommends that the user wait for an
acknowledgement of receipt of a packet before sending the next packet.
There are four LEDs provided for the status of Ethernet connection. The representation of LED status
is given below.
LED Status
F Uses Fiber Link
C Uses Full Duplex – will blink when a collision Uses Full Duplex – will blink when a collision occurs with half
duplex
L Ethernet link established – will blink for any activity
100 Uses 100Base T speed Ethernet
Addressing
There are three levels of addresses that define Ethernet devices. The first is the Ethernet or hardware
address. This is a unique and permanent 6 byte number. No other device will have the same Ethernet
address. The DMC-2100/2200 Ethernet address is set by the factory and the last two bytes of the
address are the serial number of the controller.
The second level of addressing is the IP address. This is a 32-bit (or 4 byte) number. The IP address is
constrained by each local network and must be assigned locally. Assigning an IP address to the
controller can be done in a number of ways.
The first method is to use the BOOT-P utility via the Ethernet connection (the DMC-2100/2200 must
be connected to network and powered). For a brief explanation of BOOT-P, see the section: Third
Party Software. Either a BOOT-P server on the internal network or the Galil terminal software may be
used. To use the Galil BOOT-P utility, select the registry in the terminal emulator. Select the DMC-
2100/2200 and then the Ethernet Parameters tab. Enter the IP address at the prompt and select either
TCP/IP or UDP/IP as the protocol. When done, click on the ASSIGN IP ADDRESS. The Galil
Terminal Software will respond with a list of all controllers on the network that do not currently have
IP addresses. The user selects the controller and the software will assign the controller the specified IP
address. Then enter the terminal and type in BN to save the IP address to the controller's non-volatile
memory.
CAUTION: Be sure that there is only one BOOT-P server running. If your network has DHCP or
BOOT-P running, it may automatically assign an IP address to the controller upon linking it to the
network. In order to ensure that the IP address is correct, please contact your system administrator
before connecting the controller to the Ethernet network.