Remote/Local Operation - TTI EL302P Manual De Instrucciones

Remote/Local Operation

At power on the instrument will be in the local state with the Rem (remote) lamp off. When a
command is received the remote state will be entered and the Rem lamp will be turned on. The
rotary Controls are not locked out by this action and the instrument will be returned to the local
state if they are used; however, if the instrument receives another character from the interface,
the remote state will again be entered.
Local operation of the rotary controls, output On/Off switch and CHANGE button can be disabled
by pressing the OPTION SELECT/OK button until
right-hand display shows the current setting,
button selects
again to confirm and exit the change mode.
Local operation can be restored at any time by pressing the OPTION SELECT/OK button; if
LoCL has been set to
local control and subsequent presses select the other modes as described above.
RS232 Connector
The 9-way D-type serial interface connector is located on the instrument rear panel. The pin
connections are as shown below:
Pin
1
2
3
4
5
6
7
8
9
Connect to a PC with a cable which has pins 2, 3, 5, wired plus pins 1, 4, 6 and pins 7 and 8,
linked at the PC end, see diagram.
Baud rate is set as described above; the other interface parameters are fixed as follows:
RS232 Character Set
Any ASCII code can be used. Bit 7 of ASCII codes is ignored, i.e. assumed to be low. No
distinction is made between upper and lower case characters in command mnemonics and they
may be freely mixed. The ASCII control codes between 00H and 31H are ignored, except for 0AH
(Line Feed, LF) which is used as a command terminator.
10
on oFF
or ; when the required setting is displayed press OPTION SELECT/OK
oFF the first press of OPTION SELECT/OK returns the instrument to
Name Description
DCD Linked to pins 4 and 6
TXD Transmitted data from instrument
RXD Received data to instrument
DTR Linked to pins 1 and 6
GND Signal ground
DSR Linked to pins 1 and 4
RTS Linked to pin 8
CTS Linked to pin 7
- No internal connection
Start Bits: 1
Data Bits: 8
LoCL
appears in the left-hand display; the
on or oFF . Alternate presses of the CHANGE
Parity: None
Stop Bits: 1