User Manual
A9000
AC Power Source
76
│
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6. Remote operation
6.1 Introduction
DME-A902ABT SERIES can be remotely controlled by GPIB or RS-232. GPIB interface
is an 8-bit parallel data bus cooperate control line to manage communication. RS-232
transmits data seriously so communication speed is slower.
If transmission speed is faster than data processing speed of micro-processor, micro-
processor will neglect new received command when there is command under processing.
6.1.1 Set GPIB address and RS-232 Parameters
GPIB and RS-232 parameters can be set at CONFIG page. Default address for GPIB is 30,
baud rate for RS232 is 9600, and Even/odd parity check for RS232 is NONE.
6.1.2 RS-232 pin definition
RS-232 interface uses RXD and TXD signals only. RS-232 implements 9PIN D-SUB type
female connector, pin definition listed as below.
pin
in/out
definition
1
NC
NC
2
OUTPUT
TXD
3
INPUT
RXD
4
NC
NC
5
GND
GND
6
NC
NC
7
NC
NC
8
NC
NC
9
NC
NC
6.1.3 GPIB Interface
GPIB function
explanation
Interface function
Sender/
receiver
GPIB bus may transmit or receive
data by this function. Use following
commands to read information.
AH1
,
SH1
,
T6
,
L4
Service request AC source will pull SRQ pin to low
voltage when interfaced instruments
have service request.
SR1
Remote/local
control
AC source can be controlled by front
panel locally or GPIB remotely.
Press Unlock to switch from remote
control back to local control, other
keys are inactive during remote
control.
RL1