Chapter 3 Connection 11
RDU-S Rack Data Unit User Manual
DO2
12V G
ND
DO1
12V G
ND
USB
USB
Micro SD
USB CO
NFIG
ETH
DI1
DI2
DI3
COM1
DO1
DO 2
ALARM
POW
ER
RUN
TH_BU
S
COM2
COM1
1
2
TH_BUS
COM2
IRM sensor port
100-240V
~
Input
Figure 3-7 Position of IRM sensor port
Pin definition
The pin definition of the IRM sensor port is shown in Figure 3-8.
1 2 3 4 5 6 7 8
1: 12Vdc
2: NC
5: NC
Pin dfinition
3: NC
4: GND
6: NC
7: D+
8: D-
Figure 3-8 Pin definition of IRM sensor port
Connection method
Use a standard network cable with RJ45 connectors on both ends, insert one end into the IRM sensor port, and insert
the other end into the RJ45 port of IRM series temperature sensor or temperature & humidity sensor.
3.3 Connecting Serial Ports
The serial ports (silkscreen: COM1, COM2) are used to connect Emerson serial PDU.
Port position
The positions of the serial ports are shown in Figure 3-9.
DO2
12V G
ND
DO1
12V G
ND
USB
USB
Micro SD
USB CO
NFIG
ETH
DI1
DI2
DI3
COM1
DO1
DO2
ALARM
POW
ER
RUN
TH_BU
S
COM2
COM1
1
2
TH_BUS
COM2
Serial ports
100-240V
~
Input
Figure 3-9 Positions of serial ports
Pin definition
The pin definitions of the serial ports are shown in Figure 3-10.
1 2 3 4 5 6 7 8
1: R+
2: R-
5: GND
Pin dfinition
3: TXD
4: GND
6: RXD
7: T+/D+
8: T-/D-
1 2 3 4 5 6 7 8
1: NC
2: NC
5: GND
Pin dfinition
3: TXD
4: GND
6: RXD
7: D+
8: D-
COM1 COM2
Figure 3-10 Pin definitions of serial ports
Connection method
When Emerson serial PDU is required to be monitored by the data unit, use standard Cat5 cable to connect the
RS485 port of PDU with the serial port of the data unit. If multiple PDUs need to be monitored, use standard Cat5
cable to connect the Link port of the upper PDU with the RS485 port of the lower PDU in daisy chain mode, as shown
in Figure 3-11.
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