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Installation
D397-01-880 Issue E
3.3.4.3
Using status outputs
Status outputs provide a means for external systems to react based upon the current state of the TIC.
Relay setpoints: The setpoint outputs can be used to interface to external logic or can be used to drive relays. Each
output can be configured in software to activate at a certain pressure. Refer to
these outputs. Each relay can be manually controlled. Refer to
.
Two types of relay box are available as options from Edwards with either 3 or 6 relay outputs.
The relay box has built in relays that can switch external loads and provides a connector to interface to an external
system. Refer to the relay box instructions for further information on using the setpoint outputs.
To drive a relay without a relay box, connect the coil of a suitable 24 V d.c. relay between 'Setpoint Output' (negative)
and 'Power Supply Positive' (positive).
Alarm: Alarm can be used to interface to external logic or can be used to drive a relay. This output is normally active
and will become inactive in the event of an alarm condition.
To drive a relay, connect the coil of a suitable 24 V d.c. relay between 'Alarm Output' (negative) and 'Power Supply
Positive' (positive).
3.3.5
Connecting the serial interface
The TIC has two serial communications protocols built in, RS232 and RS485. RS232 is the simpler interface and can
be used to allow a host PC to control the TIC. RS485 allows a host PC to control a small network of TICs.
3.3.5.1
Connecting RS232
The TIC is fitted with a 9-way 'D' type socket on the rear panel (
, item 3). The interface uses two lines for
data transfers and an additional line as a signal common. Hardware handshaking is not implemented.
If connecting to an IBM compatible PC fitted with a 9-way 'D' type socket then a 'straight through' male-female 9-way
extension cable can be used to connect the TIC to the computer as shown in
. Connection to an IBM PC fitted
with a 25-way serial connector should be made as shown in
.
Use shielded cable for the interface to reduce interference problems and limit the length of the RS232 link to less
than 10 metres. For longer links, either install line drivers or use RS485.
Figure 10 - IBM PC RS232 interface - 9-way
WARNING
‘SYSI’ is not fail safe and should not be relied upon for safety critical applications.
Содержание D397-01-000
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