RS232 & GPIB INTERFACE
45
The COM port should have the following configuration. 9600 baud, 8 data bits, 1
stop bit, no parity. This interface does not support XON/XOFF protocol or any
hardware handshaking. The controller should be configured to ignore the
handshaking lines DTR (pin 4), DSR (pin 6) CTS (pin 8) and RTS (pin 7). If the
port can not be configured through software to ignore the lines then the handshake
lines should be jumpered together in two different sets. Pins 4 and 6 jumpered
together and pins 7 and 8 jumpered together at the controller end of the cable.
When sending command over the RS232 bus the instrument will echo a response
string identical to the string that was sent if the transfer was recognized and
accepted by the instrument. This allows for software handshaking, to monitor and
control data flow. If there is an error with the command string that is sent, the
instrument will respond with 15h or the “NAK” ASCII control code. When
requesting data from the instrument, it automatically send the data to the
controller input buffer. The controller input buffer will accumulate data being sent
from the instrument including the echo response string, until it is read by the
controller.
12.8 7611 GPIB Interface Command List
When the GPIB controller sends a correct command beginning with an “S” or “F”
the instrument will echo back the identical command string. A GPIB read
command must be sent after the command string to view this echo response.
If an error occurs when a command is sent, or the instrument does not recognize
the command then the instrument will respond with a value of ASCII “NAK”
(15hex), after the read command is sent. Each string should be terminated by
ASCII <LF> and <CR>. ALL commands are case sensitive.
12.8.1
Parameter Selection Commands
The following commands are used to toggle ON/OFF functions or menu selection
items. No other values or additional parameters are needed to execute these
commands.
System Settings and Commands
Command Function
FA Test
FB Reset
FQ Connect On
FR Connect Off
FS Fail Stop On
FT Fail Stop Off
FY Single Step On
FZ Single Step Off
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