GridRouter™ User Guide
12
3.3.2 Ethernet
This Ethernet port connects the GridRouter to another Ethernet network device on a wired network. The
Eth1 and Eth2 LEDs represent Ethernet Link and Activity respectively.
3.3.3 Serial
There are two serial interfaces on the GridRouter and they have RJ45 connectors referred to as Port 0
and Port 1. A mezzanine board attached to the power supply board defines whether the ports are RS232
or RS485. The RS232 board makes both Port 0 and Port 1 communicate via RS232. The RS485 board
turns Port 0 into an RS485 port and Port 1 into an RS232 port. The RS485 board has 3 jumpers which
control whether the card is half-duplex or full-duplex. If all of the jumpers are installed then the board is in
half-duplex mode. If none of the jumpers are installed then the board is in full-duplex mode. The pin
definitions for both RS232 and RS485 ports are shown below.
RJ45 Pin No.
Signal Description
Abbr.
DTE (GridRouter)
DCE
1
DCE Ready
DSR
In
Out
2
Received Line Signal Detector
DCD
In
Out
3
DTE Ready
DTR
Out
In
4
Signal Ground
SG
5
Received Data
RxD
In
Out
6
Transmitted Data
TxD
Out
In
7
Clear To Send
CTS
In
Out
8
Request To Send
RTS
Out
In
Table 3-1: RS232 Port Pinout
RJ45 Pin No.
Signal Description
Abbr.
1
VISO PWR
2
N/C
3
N/C
4
Shield Ground
GND
5
Tr (TXP)
RxD
6
Receive – (RXN)
TxD
7
Transmit – (TXN)
CTS
8
R (RXP)
RTS
Table 3-2: RS485 Port Pinout