4 Chapter 1 Product Introduction
RDU-A G2 Intelligent Monitoring Unit User Manual
Table 1-9 Electric parameters of sensor port
Silk print
Definition
Rated output
voltage
Output current
(total)
Maximum output
power (total)
Overload protection of the
port
Sensor1
First route of
sensor port
+12Vdc
≤ 0.4A
4.8W
Supportive of overload
protection
Sensor2
Second route of
sensor port
The port adopts RS-485 communication mode, used to connect Emerson intelligent temperature & humidity sensor,
intelligent temperature sensor and intelligent digital expansion module. See Table 1-10 for its communication
parameters.
Table 1-10 Communication parameters of sensor port
Parameter
Baud rate
Bit
Parity
Stop bit
Value
9600bps
8 bits
None
1 bit
COM port
The RDU-A G2 host supplies three independent COM port, namely, COM1, COM2 and COM3 (COM3 includes two
RJ45 interfaces). Their positions are shown in Figure 1-1.
The port adopts RS-485/RS-232C (adaptive) communication mode. See Table 1-11 for the communication
parameters.
Table 1-11 Communication parameters of COM port
Parameter
Baud rate
Bit
Parity
Stop bit
Value
1200bps, 2400bps,
4800bps, 9600bps,
19200bps (optional)
5 ~ 8 bits
Even/Odd/None/Mark/Space
1 ~ 2 bits
Note: The combination mode of 5-bit word size and 2-bit stop bit is not supported
1.2.2 Expansion Card
IRM-4COM card (optional)
The IRM-4COM card provides four series ports, which support connecting user equipment (RS284/RS232C line
sequence is adaptive) in RS232/ RS485 communication mode. Its appearance is shown in Figure 1-2.
Indicators
Power
COM5
Series ports
COM6
COM7
COM8
COM5
COM6
COM7
COM8
Figure 1-2 IRM-4COM card
See Table 1-12 for the indicator definition of IRM-4COM card.
Table 1-12 Indicator definition of IRM-4COM card
Silk print
Color
Status
Description
Power
Green
On
IRM-4COM card is powered on
Off
IRM-4COM card is powered off
COM5 ~ COM8
Yellow
Blinking
Data received and sent
Off
No data received or sent
IRM-8DIAI card (optional)
The IRM-8DIAI card supplies eight digital / analog input interfaces (digital and analog are adaptive), which support
digital/ analog input. Its appearance is shown in Figure 1-3.
