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Summary of Contents for Campbell SDS-122
- Page 1 SDS-122 Serial Data Switch User Guide Issued 1.8.01 Copyright 2001 Campbell Scientific Ltd.
- Page 3 WARRANTY AND ASSISTANCE This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. ***** Batteries are not warranted.
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Page 5: Table Of Contents
4.2 Special Modes of Operation ..............6 4.3 Default Jumper settings ................9 Figures 1. General View of SDS-122 ................1 2. Pin Positions for Datalogger Port: 9-way Male ‘D’ Type Connector ..2 3. Pin Positions for Switched Datalogger Port ‘B’: 9-way Female ‘D’ Type Connector ....................3... -
Page 7: Introduction
The SDS-122 can support both DTE and DCE devices without the need for a null modem cable, and can emulate an SC932 (9-pin to RS232-DCE) interface. One port of the SDS-122 can also be configured to emulate an optically isolated SC32A interface in either DCE or DTE mode. -
Page 8: Operational
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 SERIAL I/O Figure 2 Pin Positions for Datalogger Port: 9-way Male ‘D’... -
Page 9: Pin Positions For Switched Datalogger Port 'B': 9-Way Female 'D' Type Connector
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. Switched Datalogger Port B SERIAL I/O Figure 3 Pin Positions for Switched Datalogger Port ‘B’: 9-way Female ‘D’... -
Page 10: Pin Positions For Switched Rs232 Port 'A': 25-Way Female 'D' Type Connector
B is being used or logic low when port A is being used. When this line is pulled high, the SDS-122 will be in MANUAL mode and only the port that is selected by the user (by using the... -
Page 11: Installation
CR10/10X datalogger and the SDS-122, plus a power supply or other equipment. Use one SC12 cable to connect the SDS-122’s ‘datalogger’ port to a datalogger port, and a second to connect port ‘B’ to a compatible modem. A computer/short haul modem can be connected to port ‘A’... -
Page 12: Jumper Configuration
It is envisaged that most applications will be with a telephone modem connected to Port B and a personal computer connected directly to Port A. The SDS-122, as supplied, has its jumpers set to this default configuration – please see Figure 5. -
Page 13: Default Jumper Positions On Circuit Board
User Guide OPEN OPEN OPEN CONN 4 Figure 5 Default Jumper Positions on Circuit Board... -
Page 14: Jumper Positions For A Rad-Srm Short Haul Modem On Port A
SDS-122 Serial Data Switch OPEN CLOSED OPEN Figure 6 Jumper Positions for a RAD-SRM Short Haul Modem on Port A... -
Page 15: Default Jumper Settings
3-way screw terminal will output 0V for switch on port A, or 5V for switch on port B when the SDS-122 is in AUTO mode only. When the jumper is not fitted, or the unit is in MANUAL mode, then the line becomes an input. - Page 16 SDS-122 Serial Data Switch PL50 Not fitted When jumper PL50 is fitted, not less than 4.3V is supplied to pins 20 and 4 of port A in DTE mode and to pins 5 and 6 of port A in DCE mode. RAD-SRM modems in interactive communications would need the PL50 jumper to be fitted.