IET Labs VI-700, Руководство по эксплуатации

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VI-700 V&l Source
11
Chapter 5
SERIAL INTERFACE OPTION
IET Direction
Pin RS232 Signal Name In / Out
1 AA Chassis n/a
2 BA Send Data
ð ð ð ð ð
3 BB Receive Data
ï ï ï ï ï
4 CA Request to Send
ð ð ð ð ð
5 CB Clear to Send
ï ï ï ï ï
8 CF Signal Detected
ï ï ï ï ï
20 CD Data Terminal Rdy
ð ð ð ð ð
5.4 SERIAL Option Operation
The SERIAL option uses the same command set as
the IEEE option. Additional commands exist for con-
figuring the serial interface. Changes to the serial
UART take place at power-on or after a reset.
SCPI command strings must be followed by a <CR>
to terminate the message. Every command returns a
response that includes a message terminator. The pro-
gram/operator should wait for this message termina-
tor before sending additional commands.
Command characters are not echoed to the interface
on power up. Send <CTRL-E> to force the control-
ler to echo commands back to the interface or
<CTRL-F> to disable echo.
By default, the controller returns ">" and <LF> as a
prompt after executing any command. When echo is
turned 'On', the controller returns <CR><LF> and
">"as a prompt after executing any command.
Echo-back RS232 Message
Mode Prompt Terminator
On CR LF > CR LF
Off >LF LF
5.1 Introduction
The SERIAL option adds RS-232C and SCPI 1994.0
capability to the VI-700 series instruments. The SCPI
standard provides a tree like series of standard com-
mands for programmable instruments so that similar
instruments by different manufacturers can be con-
trolled by the same program. A VI-700 SCPI com-
mand reference is included in Appendix A.
Tutorials are available on-line; consult IET for addi-
tional information. A software Serial “keyboard” may
be requested from IET to perform elementary com-
mands for training and testing. See Section 5.5.
5.2 Capabilities
The SERIAL option provides remote control over the
output value; it does not control the range.
5.3 Signal Interface and
Communications Settings
A 25 pin male DTE interface connector conforming
with EIA-STD-RS-530 is located on the rear-panel.
The default communications parameters are:
Connection of a PC to the VI-700 SERIAL option is
typically made through a simple null-modem or
“LapLink” cable.
Parameter Default Range/Choices
Baud 9600 300 - 115,200
Data Bits 8 7 or 8
Stop Bits 1 1 or 2
Parity None Odd, Even, None
SERIAL INTERFACE