1
1
C
C
H
H
A
A
N
N
N
N
E
E
L
L
T
T
E
E
M
M
P
P
E
E
R
R
A
A
T
T
U
U
R
R
E
E
T
T
R
R
A
A
N
N
S
S
M
M
I
I
T
T
T
T
E
E
R
R
8
8
O
O
F
F
2
2
5
5
1
1
2
2
0
0
-
-
3
3
5
5
9
9
-
-
1
1
2
2
T
T
Y
Y
P
P
E
E
S
S
I
I
L
L
B
B
U
U
S
S
-
-
T
T
X
X
1
1
T
T
U
U
S
S
E
E
R
R
M
M
A
A
N
N
U
U
A
A
L
L
I
I
s
s
s
s
u
u
e
e
:
:
0
0
5
5
Photograph 2 Access to console port and programming switch
The black four pin console port connector and the red programming switch are located
behind the upper left corner of the front panel label. The red programming switch selects
the mode the unit is in, either “RUN” or “PROG” mode. You must always be in “RUN” mode
for unit to operate correctly. “PROG” mode is used to configure the unit when no SILBUS
network power is available.
4 THEORY OF OPERATION
The single channel temperature transmitter takes a single input from a PT100 sensor and
transmits it onto the connected SILBUS network using either the ANALINK or FASTLINK
protocols. The temperature input is converted to a sixteen bit (Fastlink) or eight bit (Analink)
value ready for transmission on the configured SILBUS channel. The analogue
transmission protocol can be configured for the temperature input. See Austdac document
120-009-10 for a more detailed description of SILBUS communications.
The PT100 sensor is a two, three or four wire resistor that varies its resistance according to
the surrounding temperature. The sensor has a resistance of 100
Ω at 0ºC. The sensor
resistance increases with temperature. The PT100 sensor will work with 2 wires but the
resistance of the sensor leads also contribute to the change in resistance and introduce
errors. Three and four wire sensors provide Kelvin connections that allow for the lead
resistance errors to be compensated out of the final temperature reading. The SILBUS-
TX1T carries out three-wire lead compensation on three and four-wire sensors, two-wire
sensors will work with the transmitter but no compensation is possible. Use three or four-
