Setting Up; Termination Resistors; Protocol - ABB COMMANDER 300 Operating Instructions Manual

5 SETTING UP

For all aspects other than serial data
transmission the controller is set up as
shown in the Operating Instructions (IM/
C300). Unless otherwise requested, the
instrument is despatched
transmission rate
transmission line
linked-out. If the resistors are to be linked-in
(see Fig. 4.2) carry out the following section.
5.1 Termination
Resistors – Fig. 5.1
For long transmission lines, termination
resistors are required on the last C300
Controller in the chain and at the host
computer/computer terminal – see Fig. 4.2.
Under normal operating conditions the
resistors are required at the receive inputs
only. The controller's resistors are selected
using plug-in links – see Fig. 5.1.
Switch off the supply and remove the
controller from its case (Fig. 2.1 in the
Operating Instructions, IM/C300). Set the
termination resistor links as shown in
Fig. 5.1.
4
with
of 9600 baud and
termination resistors
Identify
Links
1
Invert
Controller
Fig. 5.1 Selecting the Termination Resistors

6 PROTOCOL

The protocol used is based on ANSI-X3.28-
1976-2.5-A4 and is used for master (host
computer)
systems. This is the
a
for use with supervisory systems
Kent-Taylor PC30. The Protocol is:
Start transmission (STX) – Command –
Identification ... End transmission (ETX)
– see Figs. 8.1 to 8.6 on pages 7 and 8.
Transmission of commands and processing
of the subsequent
incorporated
programme.
2
Position links
Termination
Resistors
Linked-out
to slave (C300
recommended protocol
replies
into the host
3
Termination
Resistors
Linked-in
Controller)
such as ABB
must be
computer