Setting The Module Jumpers - Automation Direct DL405 User Manual

9–4
F4–08RTD 8-Channel RTD Input

Setting the Module Jumpers

Jumper Locations
Jumper Descriptions
Factory Default
Settings
Selecting
Fahrenheit or
Celsius
The module has several options that you can select by installing or removing
jumpers. At the rear of the module is a bank of eight jumpers. You can select the
following options by installing or removing the jumpers:
S
Number of channels: 1 thru 8.
S The input type: 10 Ω (ohms) or 25 Ω copper RTDs; Pt100 Ω , jPt100 Ω,
Pt1000 Ω RTDs.
S
Temperature conversion: two's complement or magnitude plus sign
format in Fahrenheit or Celsius.
To prevent losing a jumper when it is removed, store it near its original location by
sliding one of its sockets over a single pin (like the RTD-2 jumper setting below).
Jumper Descriptions
(located below jumper
on PC board)
UN-1
UN-0
RTD-2
RTD-1
RTD-0
CH+4
CH+2
CH+1
By default, the module arrives from the factory as shown above with all jumpers
installed except for the RTD-2 jumper (the third jumper from the top), which has the
jumper removed. These settings select eight active channels, convert temperatures
into Fahrenheit readings using magnitude plus sign, with Pt100Ω RTD type.
The top two jumpers, UN-0 and UN-1, select the
conversion unit. The options are magnitude plus sign
or two's complement, in Fahrenheit or Celsius. The
module comes from the factory with both jumpers
installed for magnitude plus sign conversion in
Fahrenheit.
All RTD types are converted into a direct temperature
reading in either Fahrenheit or Celsius. The data
contains one implied decimal place. For example, a
value in V-memory of 1002 would be 100.2_ C or F.
Negative temperatures can be represented in either
two's complement or magnitude plus sign form. If the
temperature is negative, the most significant bit in the
V-memory location is set (X37).
Functional Descriptions
UN-1
UN-0
RTD-2
RTD-1
RTD-0
CH+4
CH+2
CH+1
Temperature
Conversion
Units
RTD Type
Number of
Active Channels
UN-1 Temperature
UN-0
Conversion Units