44
DB9 Serial Interface
1 +5V
2 TXD
3 RXD
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
The output of DB9 interface on the rear-panel of the power supplier is TTL voltage level, so the pin
outs of the voltage level shift cable（M-131 or M-133）must be set-up to match the PC before connecting
the DB9 interface with the serial interface on PC.
M-131 Voltage Level Shift Cable PC
1
2
3
4
5
6
7
8
9
VCC
RXD
TXD
NC
GND
NC
NC
NC
NC
8
6
1
2
7
9
4
5
3
RTS
RXD
NC
GND
DTR
NC
NC
TXD
VCC
M-133 Voltage Level Shift Cable PC
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