Vaisala DEWCAP DM500 Betriebsanweisung PDF herunterladen (Seite 76)

User's Guide ______________________________________________________________________

74 __________________________________________________________________ M210205EN-D

CAUTION

The dip switches behind the DMI500 MUST NOT be touched,

because the processor may be destroyed as a result of false dip switch

positions.

NOTE

Before connecting a PC to DMI500 or DMP501, make sure there is

no ground potential difference between PC and the DM500.

Serial Communication Settings

Connect the DM500 to PC by using a serial cable (provided). When

connecting EIA-232 (RS232), use the port called 'SERIAL'. When

connecting optional RS485, use the port called 'RS485/LON'. Connect

the RS485 as follows:

Table 2 4-Wire Connection

Terminal Data Line

1 R+ (input to DM500) ←

2 R- (input to DM500) ←

3 T+ (output from DM500) →

4 T- (output from DM500) →

5 Shield

Table 3 2-Wire Connection

Terminal Data Line

1 R/T+ connect the same line to

terminals 1 and 3

2 R/T- connect the same line to

terminals 2 and 4

3 R/T+ connect the same line to

terminals 1 and 3

4 R/T- connect the same line to

terminals 2 and 4

5 Shield

Select the DM500 communication mode and data transfer settings as

follows:

1. Open

MENU: press .

2. Select ►Interfaces, press .

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Vaisala DEWCAP DM500 Betriebsanweisung Seite 76