Using Sockets - Agilent Technologies N8900 series Operating Manual

Using Sockets

Power supplies allow any combination of up to six simultaneous data socket, control socket, and tel-
net connections to be made.
Agilent instruments have standardized on using port 5025 for SCPI socket services. A data socket on this port can be
used to send and receive ASCII/SCPI commands, queries, and query responses. All commands must be terminated
with a newline for the message to be parsed. All query responses will also be terminated with a newline.
The socket programming interface also allows a control socket connection. The control socket can be used by a client to
send device clear and to receive service requests. Unlike the data socket, which uses a fixed port number, the port num-
ber for a control socket varies and must be obtained by sending the following SCPI query to the data socket:
SYSTem:COMMunicate:TCPip:CONTrol?
After the port number is obtained, a control socket connection can be opened. As with the data socket, all commands to
the control socket must be terminated with a newline, and all query responses returned on the control socket will be
terminated with a newline.
To send a device clear, send the string "DCL" to the control socket. When the power supply has finished performing the
device clear it echoes the string "DCL" back to the control socket.
Service requests are enabled for control sockets using the Service Request Enable register. Once service requests have
been enabled, the client program listens on the control connection. When SRQ goes true the instrument will send the
string "SRQ +nn" to the client. The "nn" is the status byte value, which the client can use to determine the source of
the service request.
Interface Lockout
The USB interface, LAN interface, and the Web server are enabled when shipped. To enable or disable the interfaces
from the front panel:
Front Panel Menu
Select System\Admin\IO
Enable or disable the interfaces by checking or
unchecking the following items:
Enable LAN, Enable GPIB, and Enable USB
Then press Select.
If you cannot access the Admin menu, it may be password protected.
Agilent N8900 Series Operating and Service Guide
SCPI Command
Not available
Remote Interface Configuration
51