Applied Motion SSM23IP-2EG - Manual (Page 16)

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SSM23Q/IP Hardware Manual
Ports are used to direct traffic to the right application once it gets to the right IP address. The UDP
eSCL port in our drives is 7775. To send and receive commands using TCP, use port number
7776. You’ll need to know this when you begin to write your own application. You will also need
to choose an open (unused) port number for your application. Our drive doesn’t care what that is;
when the first command is sent to the drive, the drive will make note of the IP address and port
number from which it originated and direct any responses there. The drive will also refuse any
traffic from other IP addresses that is headed for the eSCL port. The first application to talk to a
drive “owns” the drive. This lock is only reset when the drive powers down.
If you need help choosing a port number for your application, you can find a list of commonly used
port numbers at http://www.iana.org/assignments/port-numbers .
One final note: Ethernet communication can use one or both of two “transport protocols”: UDP and
TCP. eSCL commands can be sent and received using either protocol. UDP is simpler and more
efficient than TCP, but TCP is more reliable on large or very busy networks where UDP packets
might occasionally be dropped.
Option 1: Connect a Drive to Your Local Area Network
If you have a spare port on a switch or router and if you are able to set your drive to an IP address
that is compatible with your network, and not used by anything else, this is a simple way to get
connected. This technique also allows you to connect multiple drives to your PC. If you are on a
corporate network, please check with your system administrator before connecting anything new
to the network. He or she should be able assign you a suitable address and help you get going.
If you are not sure which addresses are already used on your network, you can find out using
“Angry IP scanner”, which can be downloaded free from http://www.angryip.org/w/Download . But
be careful: an address might appear to be unused because a computer or other device is currently
turned off. And many networks use dynamic addressing where a DHCP server assigns addresses
“on demand”. The address you choose for your drive might get assigned to something else by the
DHCP server at another time.