Keysight B2980B User’s Guide, Edition 1 77
Installation
Communicating Over the LAN
The socket programming interface also allows control socket connections. 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 number
for a control socket varies and must be obtained by sending the following SCPI
query to the data socket: SYSTem:COMMunicate:TCPip:CONTrol?
Once 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
B2980 has finished performing the device clear, it will echo 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 becomes 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.
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