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...4.3 Panel-mounted Instrument Connections – Figs. 4.4 and 4.5
Retransmission
Output
Normally Closed
Relay 1
Normally Open
Normally Closed
Relay 2
Normally Open
Mains Supply
Warning. The power supply earth (ground) must be connected to ensure safety to personnel, reduction of the
effects of radio frequency interference (RFI) and correct operation of the power supply interference filter. Connect the
earth lead directly to the case earth stud and not to the 'E' terminal.
1
2
3
4
5
6
7
8
9
E
N
L
Earth Stud
TBA
+
1
–
2
3
4
Common
5
6
7
Common
8
9
E
Neutral
N
Live
L
Earth
Earth Stud (on case)
Fig. 4.5 Panel-mounted Instrument Connections
4 ELECTRICAL CONNECTIONS...
1
2
3
4
5
6
7
8
9
10
11
12
TBB
1
0V
2
Rx–
RS422/RS485 Serial Interface
3
Rx+
(If fitted)
4
Tx–
5
Tx+
6
Channel 2 – Logic temperature alarm
7
from Interface Electronics Unit
8
9
–
10
Channel 1 – Retransmission input
11
+
(output from Interface Electronics Unit)
12
Sleeved Links
11
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