Campbell-scientific SDM-SIO1 Serial Input/Output Module Bedienungsanleitung PDF herunterladen (Seite 13)

SDM-SIO1 Serial Input/Output Module

TABLE 3-2. SDM-SIO1 Connections (left to right as viewed from the front of the unit)

SDM Power Connections RS-232 Connections RS-485/RS-422

C1 C2 C3 G +12 V G RX-A CTS-B RTS-Y TX-Z 0 V Z Y B A

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

15 14 13 12 10 9 8 7

Note: Italic numbers indicate which pins are connected internally (for use with RS-485 termination resistors etc.).

For example the signals present on pin 7 will also be present on pin 15.

TABLE 3-3. SDM-SIO1 Functional Description of the Connections

Case Text Description

1 C1 SDM data enable line – connect to datalogger SDM C1

2 C2 SDM clock line – connect to datalogger SDM C2

3 C3 SDM data line – connect to datalogger SDM C3

4 G Connect to the datalogger power ground (G)

(1)

5 +12 V Main power supply – connect to logger 12 V

6 G RS-232 0 V reference/second G connection

(2)

7 RX-A RS-232 receive line

8 CTS-B RS-232 CTS hardware handshaking line / output

9 RTS-Y RS-232 RTS hardware handshaking / input

10 TX-Z RS-232 transmit line

11 0 V RS-485 0V reference line

(3)

12 Z ‘–’ RS-485 output line, line Z

13 Y ‘+’ RS-485 output line, line Y

14 B ‘–’ RS-485 input line, line B

15 A ‘+’ RS-485 input line, line A

(1) At least one of the two G terminals (‘G’) must be connected to the logger’s

ground terminal or earth boss.

The ground connection to the datalogger should be made

with large gauge wire, e.g. 16/0.2 to provide a low

impedance path to ground to allow full protection from

static and electrical transients.

CAUTION

(2) The ‘G’ (pin 6) can be used for the RS-232 zero volt reference or any other

ground connection needed, e.g. shields.

(3) There is a 100R resistor in series with the datalogger’s ground connection.

This connection should be used when connecting RS-485 equipment by long

wire lengths. It insures both systems have a common ground reference point.

See Section 3.2, Safety Considerations, before connecting.

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Campbell-scientific SDM-SIO1 Serial Input/Output Module Bedienungsanleitung Seite 13