GW Instek PSM-Series Programming Manual - Manual (Page 4)

PSM SERIES PROGRAMMABLE POWER SUPPLY
PROGRAMMER MANUAL
⎯ 5 ⎯
3. CONNECTING THE PROGRAMMABLE POWER
SUPPLY VIA RS232 INTERFACE
The RS232 interface capabilities:
The RS232 interface provides a point-to-point connection between two
items of equipment such as a computer and the power supply. There are
some parameters you need to set on the both sides. Once you have set
these parameters, you can control the power supply through the RS232
interface.
z Baud rate: You can set rates of 1200, 2400, 4800 or 9600 baud.
z Parity bit: none.
z Data bit: 8 bits.
z Stop bit: 1 stop bit.
z Data flow control: none.
Notes for RS232 installation
The power supply is a DTE device with a 9-pin D-type shell RS232
connector located on the rear panel. Figure 1 shows the equipment of 9-pin
connector (male) with its pin number assignments. Figure 2 shows the
wiring configuration for DB9 to DB9. When the programmable power
supply is set up with a RS232 interface, please check the following points:
z Do not connect the output line of one DTE device to the output line of
the other.
z Many devices require a constant high signal on one or more input pins.
z Ensure that the signal ground of the equipment is connected to the
signal ground of the external device.
PSM SERIES PROGRAMMABLE POWER SUPPLY
PROGRAMMER MANUAL
⎯ 6 ⎯
z Ensure that the chassis ground of the equipment is connected to the
chassis ground of the external device.
z Do not use more than 15m of cable to connect devices to a PC.
z Ensure the same baud rate is used on the device as the one used on PC
terminal.
z Ensure the connector for the both side of cable and the internal
connected line are met the demand of the instrument.
1. No connection
2. Receive Data(RxD) (input)
3. Transmit Data(TxD) (output)
4. No connection
5. Signal Ground(GND)
6. No connection
7. No connection
8. No connection
9. No connection
Figure 1 Pin assignments of the RS232 connector on the rear panel for DB-9-D