Campbell-scientific SDS122 Two-Way Serial Data Switch Manuale Utente Scaricare il pdf (Pagina 6)

SDS-122 SERIAL DATA SWITCH

2.2 OPERATIONAL

TABLE 1. Current Consumption in Various Modes/Communication Activity

Mode Activity Current Drain

from Datalogger

Isolated Quiescent (not communicating)

<75µA

Isolated Communicating Up to 3mA

Non-Isolated No RAD-SRM modem connected and with no

communication activity (quiescent)

<100µA

Non-Isolated RAD-SRM connected, waiting for call 2.5mA

Non-Isolated RAD-SRM in comms. session but no communication

activity

9Ma

Non-Isolated RAD-SRM communicating with PC208E or TCOM in

Monitor Mode

12mA

Non-Isolated Jumper PL50 not fitted; RAD-SRM connected but no

communication activity. (This is the one-way, print-

enabled RAD-SRM mode.)

<100µA

Normal Operating Temperature Range: -25°C to +50°C

For extended temperature range requirements please contact Campbell Scientific.

2.3 PORT CONFIGURATION/CONNECTIONS

The SDS-122 has one datalogger port, one

switched datalogger port, a 25-way switched

RS232 port and a control port.

Datalogger Port

FIGURE 2. Pin Positions for Datalogger

Port: 9-way Male ‘D’ Type Connector

The datalogger port (marked ‘LOGGER’ in

Figure 1) is a 9-way male ‘D’ type connector,

having the following pin configuration:

PIN ABBREVIATION I/O

1 +5V

20V

3 RING O

4RX O

5ME I

6 SDE/PE I

7 CLK/HS I

8 Not connected

9TX I

NOTE: When the datalogger is in

communication mode, pin 5 (ME –

Modem Enable) is held high. This line is

used by the SDS-122 to detect

communications and prevent switching to

the other port.

1 2 3 4 5

6 7 8 9

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

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Campbell-scientific SDS122 Two-Way Serial Data Switch Manuale Utente Pagina 6

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