GW Instek PSP Series - Manual (Page 14)

PSP SERIES
USER MANUAL
22
1. No connection
2. Receive Data(RxD) (input)
3. Transmit Data(TxD) (output)
4. +12V Input(*) (input)
5. Signal Ground(GND)
6. No connection
7. No connection
8. No connection
9. No connection
*Note: This pin needs a constant high signal (+12V) .
Figure 1 Pin assignments of the RS232 connector on the rear panel for DB-9-D
Figure 2 Wiring configuration for DB9 to DB9
Computer’s Connection
A personal computer with a COM port is the essential facilities in
order to operate the programmable power supply via RS232 interface.
The connections between power supply and computer are as follows:
I. Connect one end of a RS232 cable to the computer.
II. Connect the other end of the cable to the RS232 port on the
programmable power supply.
III. Turn on the programmable power supply.
IV. Turn on the computer.
EQUIPMENT COMPUTER
(DB9, DTE) (DB9, DTE)
Pin 2 Pin 2
Pin 3 Pin 3
Pin 4 Pin 4
Pin 5 Pin 5
PSP SERIES
USER MANUAL
23
RS232 message terminator
The power supply has 25 commands available. Every command is end
up with <cr> (ASCII 0Dh or ACSCII 0D 0A acceptable). The return
message <cr>of the power supply is CR/LF (ASCII 0D 0A).
*L
Function:
To obtain all the status values of the power supply.
Syntax:
L<cr> HEX = 4C 0D
Explain:
When the message L<cr>is sent to the power supply from computer,
the power supply will return the message as follows immediately:
Vvv.vvAa.aaaWwww.wUuuIi.iiPpppFffffff<cr> 37 characters
totally
The contents consist of the uppercase V,A,W,U,I,P,F, the numeral
from 0 to 9 and decimal. Further details is described as follows:
vv.vv = The present output voltage, the unit: V.
a.aaa = The present output current, the unit: A.
www.w = The present output load, the unit: W.
uu = The maximum voltage limit at present, the unit: V.
i.ii = The maximum current limit at present, the unit: A.
ppp = The maximum load limit at present, the unit: W.