Laurel Electronics LTM DPM SERIES ANALOG INPUT, SERIAL DATA OUTPUT - Manual (Page 16)

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8. OPENING YOUR TRANSMITTER CASE
WHEN TO CHANGE JUMPERS
Most users will never have the need to open the transmitter case. The transmitters are
shipped fully jumpered and ready for scaling. The signal conditioner type, range and temper-
ature sensor are specified by the model number on the transmitter label.
To select a different signal conditioner range, you may open the transmitter case and change
jumper settings. Your selected range should encompass your maximum expected signal levels.
All ranges of each signal conditioner board are factory calibrated, with calibration factors stored
in EPROM on the board.
The selection serial signal (RS232 or RS485) and excitation (5V, 10V or 15V) is achieved by
jumpers on the main board. The factory default setting for the serial signal level is RS232. The
default excitation setting for pulse input transmitters is 10V.
After changing jumper settings, you will need to enter the new information into Instrument
Setup software. While this software can sense the instrument type (transmitter, panel meter or
counter) and signal conditioner type, it cannot sense jumper settings which modify the
electrical circuit. You should also update the information on the transmitter label.
HOW TO OPEN & CLOSE THE CASE
The two clamshell halves of the case are held together with 4 bolts and 4 nuts. When removing
these, take care to ensure that they are not lost. Separate the case halves. When closing the
case, make sure the ventilation grills are properly aligned.