Boonton 4240 RF Power Meter - Manual (Page 61)

Boonton 4240 Series RF Power Meter
5. Remote Operation
5.1 GPIB Configuration
The 4240 GPIB interface is configured using the Menu > SETUP > IEEE menu. The primary listen/talk address (MLTA) can
be set to any value from 1 to 30 inclusive. The value assigned must be unique to each GPIB device. Secondary address is
not implemented.
T
ch o inform the instrument that a message has been completed, the bus controller must end all messages with a terminating
aracter and/or EOI control signal. The Model 4240 can be programmed for several combinations of terminating characters
ating characters is accomplished via the Menu > SETUP > IEEE
ntering the Remote Mode. The Model 4240 enters the remote mode when the ASCII "SI" character (hexadecimal
nel keyboard is disabled, except for the <Menu> key which serves as
n the remote state for it to respond to data messages. It is not possible to
alk Operations. The Model 4240 can be requested to talk in two ways. The "??" mnemonic is available for requesting data
eiving this mnemonic, the instrument responds by transmitting data based on the
ing interactive sequence causes the Model 4240 to transmit the measurement with
Note <ENTER> means transmit end-of-string as defined via the Menu > SETUP > RS232 > EOS LSTN
as required by the controller employed. Selection of termin
menu. There the instrument can be programmed for individual end of string characters in both listener and talker modes as
well as independently enabling the end or initiate control signal.
5.2 RS-232 Configuration
RS-232 interface is also available on the Model 4240. The command set and data transfer protocol are nearly identical to
those for IEEE. The Menu > SETUP > RS232 commands are used to configure the RS-232 interface to comply with the
terminal in use. Setting the end-of-string character and SRQ Mask is accomplished by using the EOS Talker/Listener and
SRQ Mask commands respectively.
E
0F/CTRL O) is received. In the remote state, the front pa
the return to local function. The display will show the REM indicator on the last line and enable the TLK, LSN and SRQ as
appropriate.
Returning to Local Mode. The instrument will return to the local state when; a) The <Menu> key is pressed or b) The
ASCII "SO" character (hexadecimal 0E/CTRL N) is received.
Note The instrument must be placed i
store data in the local state for execution in the remote state.
T
via the RS-232 port. Immediately after rec
current talk mode. For example, the follow
the associated units (4230 IEEE Emulation mode):
Terminal Sends Model 4240 Response
O (CTRL O/hexadecimal 0F) REM displayed on bottom line, indicating remote operation.
DB TM1 ??<ENTER> Set measurement to dBm, set the talk mode to 1 (talk measurement with units).
Data returned: “0,-3.00 dBm” - indicating no error at -3 dBm.
parameter (typically CR).
Remote Operation
5-1