Campbell SDS-122 Manual de usuario
SDS-122
Serial Data Switch
User Guide
Issued 1.8.01
Copyright 2001 Campbell Scientific Ltd.
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. ***** CSC's obligation under this warranty is limited to repairing or
replacing (at CSC's option) defective products. The customer shall assume all costs of
removing, reinstalling, and shipping defective products to CSC. CSC will return such
products by surface carrier prepaid. This warranty shall not apply to any CSC products
which have been subjected to modification, misuse, neglect, accidents of nature, or
shipping damage. This warranty is in lieu of all other warranties, expressed or implied,
including warranties of merchantability or fitness for a particular purpose. CSC is not
liable for special, indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. To obtain a Return
Merchandise Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP.,
at (780) 454-2505. An RMA number will be issued in order to facilitate Repair Personnel
in identifying an instrument upon arrival. Please write this number clearly on the outside
of the shipping container. Include description of symptoms and all pertinent details.
CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a purchase order to
cover repair costs.
Contents
1. Introduction................................................................. 1
2. Specifications ............................................................. 1
2.1 Physical.....................................................................................................1
2.2 Operational ...............................................................................................2
2.3 Port Configuration/Connections ...............................................................2
3. Installation .................................................................. 5
4. Configuration .............................................................. 5
4.1 Jumper Configuration ...............................................................................6
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
4. Pin Positions for Switched RS232 Port ‘A’: 25-way Female ‘D’ Type
Connector ................................................................................................4
5. Default Jumper Positions on Circuit Board ................................................7
6. Jumper Positions for a RAD-SRM Short Haul Modem on Port A .............8
Tables
1. Current Consumption in Various Modes/Communication Activity..............................2
1
SDS-122 Serial Data Switch
The SDS-122 is a configurable two-way serial data switch which will allow two modem
devices to be connected to a datalogger simultaneously, so allowing both remote and local
interrogation of the datalogger to be carried out. It can support both DTE and DCE devices
without the need for a null modem cable, and can operate either in manual or automatic
mode.
1. Introduction
The SDS-122 will normally be fitted in a datalogger enclosure. It allows two
modems to be connected to a single datalogger at the same time and can
automatically switch the datalogger to communicate with whichever modem
initiates communications.
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. A jumper switch is provided for
use with CR500/510, CR10/10X and CR23X dataloggers to block the
transmission of synchronous data.
The SDS-122 can be set either for fully automatic mode, or manual mode,
controlled by a datalogger control port or any logic signal. When in automatic
mode, the SDS-122 can be configured to either hold the last port rung or to
default to a specific port, when communication finishes on either port.
2. Specifications
2.1 Physical
Figure 1 General View of SDS-122
Length (over mounting lugs): 195mm
Width (over connectors): 75mm
Height: 22mm
SDS-122 Serial Data Switch
2
Mounting Holes: 4.8mm dia. (0.1875in) at 177.8mm (7in)
spacing (suitable for mounting onto an ENC
12/14 enclosure chassis plate)
Weight: 180g
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
SERIAL I/O
User Guide
3
4RX O
5ME I
6SDE/PE I
7CLK/HS I
8 Connected to pin 8 of port B (12V supply)
9TX I
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
Figure 3 Pin Positions for Switched Datalogger Port ‘B’: 9-way Female ‘D’
Type Connector
The switched datalogger port (marked ‘PORT B’ in Figure 1) is a 9-way female
‘D’ type connector, having the following pin configuration:
PIN ABBREVIATION I/O
1+5V
20V
3 RING I
4RX I
5ME O
6SDE/PE O
7CLK/HS O
8 Connected to pin 8 of the datalogger port (12V supply)
9TX O
NOTE
5 4 3 2 1
9 8 7 6
SERIAL I/O
SDS-122 Serial Data Switch
4
25-Way Switched RS232 Port A
Figure 4 Pin Positions for Switched RS232 Port ‘A’: 25-way Female ‘D’ Type
Connector
The 25-way switched RS232 port (marked ‘RS232 PORT A’ in Figure 1) is a
25-way female ‘D’ type connector, having the following pin configuration:
PIN ABBREVIATION INPUT/OUTPUT
DTE DCE
1 Frame Ground
2 TX O I
3 RX I O
4 RTS O I
5 CTS I O
6 DSR I O
7 GND
15 External Power Supply I I
20 DTR O I
Other pins are not connected.
Control Port (3-way Screw Terminal)
The control port is a 3-way terminal block with screwed connections. This
terminal block can be unplugged from the unit for ease of wiring. The terminal
connections are marked G, P and M and are used as follows:
TERMINAL CONNECTION
G 0V – It is recommended that a wire is run from this terminal
to the main protective earth point in the system to give
maximum protection from interference and transients.
P In MANUAL mode, this terminal can be pulled high to select
port B. In AUTO mode, when PL41 is fitted, it functions as an
output and will go logic high when port B is being used or logic
low when port A is being used.
M 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
P terminal) will be active.
SERIAL I/O
13 1
25 14
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