User`s guide

Chapter 1 Quick Guide RIGOL
M300 User’s Guide
1-9
external interface (namely Analog Bus Interface). The analog bus interface is a
9-pin female interface.
5 DMM Module Power Fuse
The AC power supply from the power socket is divided into two paths with one
for the DMM module and the other for other circuits except the DMM module.
M300 is equipped with the DMM module power fuse (AC 250V T250 mA). To
replace the fuse, refer to the method below.
1) Turn off the instrument and remove the power cord.
2) Press down the fuse cover using a straight screw driver and rotate
clockwise.
3) Disassemble the fuse cap and fuse.
4) Replace a specified fuse and install the fuse cap.
CAUTION
Please use the specified fuse to avoid electric shock and fire.
6 Voltage Selector
M300 supports two kinds of AC voltages (115 V and 230 V). Please select the
proper voltage scale according to the AC power used.
7 [RS-232/Alarms/Ext Trig] Mixed Interface (Male)
This interface is 25-pin male interface. You can convert this interface into two
9-pin interfaces using the Mixed Interface Convert Cable (accessory). This
breakout cable consists of a 9-pin male interface used as a standard RS232
interface and another a 9-pin female interface used for alarm output, external
trigger signal input, etc.
 RS232: via this interface, M300 can communicate with the PC and you can
control the instrument remotely via the PC.
RS232 Interface
 Alarms/Ext Trig: as shown in the figure below, pin 1 to pin 4 are used to
output TTL pulse when an alarm is generated in the corresponding alarm
channel. Pin 6 is used to receive external trigger signal. When an external
digital multimeter is connected for measurement, pin 5 and pin 6 are used
6
7
4
5
2
3
1
8
9
Pin
Name
Definition
1
--
--
2
RXD
Received Data
3
TXD
Transmitted Data
4
DTR
Data Terminal Ready
5
SGND
Signal Ground
6
DSR
Data Set Ready
7
RTS
Request To Send
8
CTS
Clear To Send
9
--
--