Vaisala HUMICAP HMP41 Podręcznik Użytkownika Pobierz pdf (Strona 28)

User's Guide ______________________________________________________________________

26 __________________________________________________________________ M211280EN-A

485-

485+

GND

REL

1011-164

Figure 12 Serial Communication and Relay

Table 3 Wiring Table

Terminal Description

1 SGND (signal ground)

2 CH1+ (signal +)

3 CH2+ (signal +)

4 Cable shield (optional)

5 Vin- (power supply - or VAC)

6 Vin+ (power supply + or VAC)

7 485-

8 485+

9 GND (ground)

10 Relay

11 Relay

Numbers 1 ... 6 in the first column of the wiring table refer to Figure 11

on page 25 and numbers 7 ... 11 to Figure 12 above.

RS-485 Bus Termination

If you use RS-485 to connect just one HMT130 to a master computer,

enable the internal termination of HMT130 by switching switches 1 and

2 ON. Make sure that the master's end of the line is also terminated (by

using master's internal termination or with a separate terminator).

If you are connecting many transmitters to the same RS-485 bus, make

sure that switches 1 and 2 are OFF and terminate the bus with separate

terminators at both ends. This allows removing any transmitter without

blocking the bus operation.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 95 96

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Vaisala HUMICAP HMP41 Podręcznik Użytkownika Strona 28