24
Sending any command from an interface without control privileges that attempts to change the
instrument status will set bit 4 of the Standard Event Status Register and put 200 into the
Execution Error Register to indicate that there are not sufficient privileges for the required action.
Note:
it is also possible to configure the privileges for a particular interface to either ‘read only’ or
‘no access’ from the Web page interface.
Remote/Local Operation
(QPX600DP only)
At power-on the instrument will be in the local state. In this state all keyboard operations are
possible. When the instrument is addressed to listen and a command is received the remote state
will be entered and REMOTE will be shown in the top line of the display. In this state the keyboard
is locked out and remote commands only will be processed. The instrument may be returned to the
local state by pressing the LOCAL key; however, the effect of this action will only remain until the
instrument is addressed again or receives another character from the interface, when the remote
state will once again be entered.
RS232 Interface
(QPX600DP only)
RS232 Interface Connector
The 9-way D-type serial interface connector is located on the instrument rear panel. The pin
connections are as shown below:
Pin
Name
Description
1
RI
Passively asserted (+V through 10k
Ω
)
2
TXD
Transmitted data from instrument
3
RXD
Received data to instrument
4
CTS
5
GND
Signal ground
6
RTS
Passively asserted (+V through 10k
Ω
)
7
DSR
No internal connection
8
DTR
9
CD
No internal connection
RS232 Connections
The RS232 interface should be connected to a standard PC port using a fully wired 1:1 male-
female cable without any cross-over connections. Alternatively, only pins 2, 3 and 5 need be
connected to the PC, but with links made in the connector at the PC end between pins 1, 4 and 6
and between pins 7 and 8, see diagram.
Baud Rate for this instrument is fixed at 9600; the other parameters are fixed as follows:
Start Bits: 1
Parity: None
Data Bits: 8
Stop Bits: 1
