19
Remote/Local Operation (QPX1200SP 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 (QPX1200SP 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
