Vaisala DMP248 Service Manual download pdf (Page 35)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 29

When the serial bus has been connected between the PC and the

transmitter, the PC is switched on. When using a PC, a terminal

emulation programme (e.g. Procomm Plus, Datastorm or Windows

terminal) is started.

The factory settings for data transfer are:

• 4800 baud

• even parity

• 7 data bits

• 1 stop bit

• full duplex

NOTE

When the serial bus settings are changed, the transmitter has to be

reset before the new settings become effective.

The processor does not allow the following combinations:

• no parity, 7 data bits, 1 stop bit: if this combination is given the

DMP248 programme will change the number of stop bits to 2.

• even or odd parity, 8 data bits, 2 stop bits: if this combination is

given the programme changes the number of stop bits to 1.

Refer to the manuals of the PC and the terminal emulation programme

when giving serial settings.

The RS 232C screw terminal cannot be used if an RS 485/422 serial

module or a current loop module is used. See Appendices 3 and 4 on

how to install and operate these modules.

In calibrating or changing the settings of the transmitter, it can be

more convenient to use the connector X17, if connector X6 is already

in use. This connector, however, transfers only RS 232C signals. If a

RS 485/422 serial port module or a current loop module has been

installed, it has to be removed before communicating through the X17

connector.

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Vaisala DMP248 Service Manual Page 35