Vaisala DMP248 Service Manual Page 124

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APPENDIX 4 ________________________________________________________________________
118 ____________________________________________________________________ U263EN-1.4
Installation
Switch the transmitter off.
Resistors R2, R3 and R4 between connectors X4 and X5 in the
component board in the cover of the transmitter are removed with
side-cutting pliers. The module is plugged in connectors X4 and X5
on the main board of the DMP248 transmitter; connector X1 on the
module board to connector X4 and connector X2 to connector X5.
RX GND TX
R2
R3
R4
X6
RX +
TX +
X4
X5
Current loop
module
X1
X2
DATA LOOPS
TX -
RX -
X17
Connect the data wires to screw terminal X6 on the main board.
Switch the power on.
Operation
The DMP248 transmitters can either be given an address or operated
without an address. Both single and dual loop wiring with half duplex
connection can be used. No address is needed when only one DMP248
transmitter is used; when several transmitters are connected to the
same line, each transmitter must be given an address in the initial
configuration.
A current loop must get its operating voltage from the master or it can
have its own (floating) power supply capable of supplying 15...40 V
and 20...30 mA. Unregulated AC/DC adapter can be used, if the
current is limited to 20 mA at least by a serial resistor.
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