Boonton 4530 Peak Power Meter User Manual - Manual (Page 75)

4-1
Boonton Electronics Chapter 4
4530 Series RF Power Meter Remote Operation
4. REMOTE OPERATION
4.1 GPIB CONFIGURATION.
The 4530 Series GPIB interface is configured using the main menu key at menu level Main Menu>Utilities>IEEE-
488>BusSetup. The primary listen/talk address (MLTA) under menu item >Address can be set to any value from 0 to
30. The value assigned must be unique to each GPIB device. Secondary address is not implemented.
The Listen string terminator character (EOS) can be set under menu item >ListnTerm to ASCII character LF (or NL,
decimal 10) or CR (decimal 13). The 4530 Series always responds to the GPIB end signal (EOI), which may be sent by
the controller with the last character of the command string or with the EOS character. If the controller does not, or
cannot send the EOI signal, a mutually agreed upon EOS character must be used.
The Talk string terminator character (EOS) can be set under menu item >TalkTerm to ASCII character LF (or NL,
decimal 10), CR (decimal 13), the two character sequence CRLF or None. The 4530 Series always sends the GPIB end
signal (EOI) with the last character of every string. If a one or two character EOS is selected, the EOI signal will be sent
with the last EOS character. If EOS is set to None, the EOI signal will be sent with the last character of the string. In
accordance with IEEE-488 specifications the EOI signal and EOS characters are not used with serial poll status byte
messages.
The string terminators must agree or be compatible with the controller in use for communication to take place. For SCPI
operation, both EOS characters should be set to LF (or NL, decimal 10).
At menu item >IEEE488>SRQ MASK, the bus service request enable byte mask value can be set. If the value is zero,
SRQ is disabled.
The menu item IEEE-488>View Buffer shows the current contents of the Listen and Talk internal buffers. Use the
∧∧∧∧∧
∨∨∨∨
∧∧∧∧
∨∨∨∨
and
∨ arrow keys to alternate between the Talk and Listen buffer displays. This feature is very useful for analyzing bus
communication problems. The buffers show what has been received from the controller and what has been returned.
The menu item IEEE-488>MNEMONIC is a multi-page list of all valid SCPI mnemonics in an outline format. Use the
∧
and
∨ arrow keys to scan through the pages. For non-SCPI commands and more detailed information, refer to this
manual.
4.2 SERIAL PORT OPERATION.
General. The RS-232 serial interface is available for 4530 Series remote control when the GPIB is not in use. The
command set and data transfer protocol are nearly identical to those for the GPIB. The Main Menu>Utilities>Serial
menu is used to configure the serial interface to match the settings the terminal or host computer in use. In serial remote
operation, the GPIB end-of-string termination characters and SRQ Mask values are used for the serial port as well. All
the normal SCPI and native-mode control commands are available over the serial port; only GPIB-specific functions
such as SRQ, serial poll, LLO, and GET can not be used in serial port remote operation.
Serial Remote Mode. The 4530 enters serial remote mode when the ASCII “SI” control code (hexadecimal 0F, Ctrl-
O) is received. In the remote state, the front panel keyboard is disabled, except for the ESC/Stop key, which serves as
the return to local function. The status window on the LCD display will show the SER annunciator to indicate that
serial remote mode is active. The instrument can also be returned to local mode by sending it the ASCII “SO”
(hexadecimal 0E, Ctrl-N) control code. When in remote mode and set for native-mode operation, the 4530 will continu-
ously place formatted measurements in its talk buffer, which can be transmitted by issuing a single character.
Serial Listen and Talk Addressing. Since the RS-232 serial port is a single-device full-duplex interface, the 4530
is always active as both a talker and a listener in serial remote mode. Any character the remote terminal transmits over
the interface will be received by the instrument, and there is no provision to “unaddress” the 4530 as a listener.
Requesting a response or measurement is accomplished by issuing the ASCII “DC2” (hexadecimal 12, Ctrl-R) control