GDU
27-1500
Original Instructions
12
9901X0265 Issue 2
The GDU uses a form of software handshaking to control the data interchange
between it and the host computer and therefore does not use the interface handshake
lines. RTS and DTR are not driven by GDU. Before connecting to the host computer
consult the computer’s manual for details of its RS232 interface connections and what
handshake lines (if any) are used. Only three connections between the GDU and the
computer are necessary, TxD, RxD and Signal 0V. Take care to ensure that the data
transmitter at the computer end is connected to the data receiver at the GDU end and
vice versa.
2.8
Configuring the Ethernet Interface
The Ethernet interface may be used as an alternative to the RS232 link. Connection to
a host PC must be made via an appropriate router supporting 10BaseT.
The default device name of the GDU can be set via switch S1 on the CPU module
1914B0065. Switch S1-5 must be OFF. Depending on the nature of the network
system, it may t
ake some time for the GDU’s register name to be recognised.
S1-1
S1-2
S1-3
S1-4
GDU Name
Off
Off
Off
Off
ELE-GDU00
On
Off
Off
Off
ELE-GDU01
Off
On
Off
Off
ELE-GDU02
On
On
Off
Off
ELE-GDU03
Off
Off
On
Off
ELE-GDU04
On
Off
On
Off
ELE-GDU05
Off
On
On
Off
ELE-GDU06
On
On
On
Off
ELE-GDU07
Off
Off
Off
On
ELE-GDU08
On
Off
Off
On
ELE-GDU09
Off
On
Off
On
ELE-GDU10
On
On
Off
On
ELE-GDU11
Off
Off
On
On
ELE-GDU12
On
Off
On
On
ELE-GDU13
Off
On
On
On
ELE-GDU14
On
On
On
On
ELE-GDU15
If the use of the registered name fails due to the network set-up then it may be
necessary to configure the IP address manually.
The GDU can be set to a static IP address by setting switch S1-5 to On. By
using the RS232 port a command is sent to configure the IP address. Refer to
section 2.7 on the RS232 comms protocol.