Valeport Ltd © 2019
0803805i - Model 803 ECM
Page 14
4. Selecting the Output Protocol
The 803 can output data via RS232 or RS485 communications, selectable by moving a single connector inside
the instrument housing, or optionally in analogue format via an additional circuit board
To gain access to this connector, the housing for the electronics must be removed by unscrewing the 6 x M5
Titanium counter sunk slotted screws that hold the housing on the bulkhead and sensor end cap.
Undo the 3 screws at the connector end of the 803 and ease the end plate from the housing. There is an
internal flexible cable at this end of the module. This requires disconnecting at the pye connector before
proceeding to the electronics.
Unscrew the 3 screws at the EM sensor end of the housing and ease this from the Titanium housing. The
boards should now be exposed.
4.1. RS232 Communications
To communicate with the instrument via RS232 communications the three way Harwin connector with the
brown, yellow & orange wires should be connected to the 3 way connection on the 0801509D circuit board
labeled RS232.
Do not adjust the position of the four way Harwin connector with the red and blue wires.
If the unit has the optional analogue output board fitted, a third connector with white, green and black wires
should be connected to this extra board.
Otherwise this lead should be left disconnected
.
4.2. RS485 Communications
To communicate with the instrument via RS485 communications the three way Harwin connector with the
brown, yellow & orange wires should be connected to the 3 way connection on the 0801509D circuit board
labeled RS485.
Do not adjust the position of the four way Harwin connector with the red and blue wires.
If the unit has the optional analogue output board fitted, a third connector with white, green and black wires
should be connected to this extra board.
Otherwise this lead should be left disconnected
.
4.3. Analogue Output
If the instrument has the optional 0801507A analogue output board fitted, then the 4 way Harwin connector
with the green, white and black wires should be connected to the connector labeled J4 on this board.
Under
no circumstances should this connector be connected to the J4 connector on the main 0801509D circuit board.