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Pakscan IIE System Manual
Serial Port 4 (the PS410 RS485 port)
Port 4 has a 9-way D-type female connector. The connections are
shown in the table for both 2 and 4 wire connections. Internal
links on the PS410 card select between 2 and 4 wire.
The RS485 port has a true tri-state output allowing 2-wire
communications to be used. The master station uses a 2-wire
RS485 highway. If a 4-wire RS485 highway is needed it must be
taken from this port and a PS410 fitted in the rack.
The master station is a slave on the RS485 highway.
Ethernet Port
The Ethernet port uses a standard RJ45 socket for communication and is normally connected to a
switch by a straight cable. If the port is used to connect directly to a PC then a cross over cable must
be used.
Master Station
RJ45 Jack
Connector
Fig 43: Connecting to a Hub or Switch
Master Station
RJ45 Jack
Connector
Fig 44: Connecting directly to a PC
126 of 132
Pin 1
Tx+
1
Tx-
2
Rx+
3
Rx-
6
Pin 1
Tx+
1
Tx-
2
Rx+
3
Rx-
6
Publication S177E V2.0 Issue 03/05
Straight through cable
Cable wiring
1
2
3
6
Cross Over cable
Cable wiring
3
6
1
2
Port 4 – RS485
2 wire
Pin No.
Function
1
NC
2
NC
3
Data –
4
RTS –
Signal
5
Ground
6
NC
7
NC
8
Data +
9
RTS +
Hub/Switch
RJ45 Jack
Connector
Tx+
Tx-
Rx+
Rx-
PC Ethernet
Interface
RJ45 Jack
Connector
Rx+
Rx-
Tx+
Tx-
4 wire
Function
NC
NC
Tx –
Rx –
Signal
Ground
NC
NC
Tx +
Rx +
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