LaserSpeed Pro 8500-4 Instruction Handbook: Ethernet Communication
8-5
8.8 TCP Communications
The LS8500-4 accepts TCP (Transfer Control Protocol) connections on port 23 (Telnet) and port 1003. The
Telnet port (Port 23) can be used by a telnet client such as the one included with Windows to manually type
commands. On this port, commands can be sent a single character at a time, and must be terminated with a
carriage return. Port 1003 is designed to interface to a computer or PLC. This port accepts whole commands
(not a single character at a time) and does not require a carriage return at the end of each command.
The commands entered on the Telnet port are identical to the RS-232 commands. See the
section for a complete listing of commands.
8.9 UDP Communications
UDP is a connectionless protocol that has much less overhead than TCP. This allows a much higher data
rate for measurements. There are two ports used in UDP communications, ports 1001 and 1002. Port 1001
is used to receive commands and send responses to commands, and port 1002 is used to send real-time
measurement data.
The destination port for UDP messages (responses or real-time data) from the LS8500-4 is the same as the
source port of the message that initiated the response. All responses to commands, such as responses to
settings request messages, are received on and sent from port 1001. All real-time data is sent from port 1002
to the port number configured with the
command. This separation allows you to create two
separate sockets on the host, one socket to send and receive commands, and a separate socket to receive
real-time data.
Commands sent to the command port (1001) of the LaserSpeed gauge must be wholly contained in a single
UDP packet with only one command per packet. No carriage return characters are permitted. UDP com-
mands terminated with a <CR> character will be ignored by the gauge.
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