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SDM-SW8A 8-Channel Switch Closure Input Module - Page 1
SW8A 8 CHANNEL SWITCH CLOSURE
INPUT MODULE
TO DATALOGGER
12V C3 C2 C1 IN C1 OUT 5V IN 1
5V IN 2 5V IN 3 5V
IN 4 5V IN 5 5V IN 6 5V
IN 7 5V IN 8
Copyright © 1987-2010 Campbell Scientific, Inc. SDM-SW8A 8 Channel
Switch Closure Module
Revision: 7/10
MADE IN USA
SDM -
SDM-SW8A 8-Channel Switch Closure Input Module - Page 2
...particular purpose. Campbell Scientific reserves the right to refuse service on the ...repairing or replacing (at www.campbellsci.com/repair. is warranted by surface carrier prepaid. Campbell Scientific, Inc. products which Campbell Scientific company serves your country. to modification, misuse, neglect, accidents of the problem, an RMA number will not process any Campbell Scientific...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 3
Specifications 2
3. Power Supply Considerations 3
4. Internal Jumpers 4
5.1 Address Jumpers 4 5.2 Measurement Jumpers 6
6. Datalogger Programming 6
6.1 CRBasic Programming 6 6.1.1 SDMSW8A Instruction 6 6.1.2 SDMSpeed Instruction...
i Connections 4
4.1 Connections to specific sections.
1. Function 1
2. SDM-SW8A Table of Contents
PDF viewers note: These page numbers ...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 5
... closure or voltage pulse inputs. Previous to October, 1988, the SDM-SW8 (no more SW8As are not compatible with CR10s containing Instruction 15, and SDM-SW8s are required, please consult Campbell Scientific's Marketing Department.
The SW8A is used for use the SDMSW8A instruction. In October, 1988, the SDM-SW8A was offered for communication with the CR10, utilizing CR10...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 7
... and may be convenient to use the datalogger supply to power peripherals. SDMSW8As shipped after March 1, 2006, remove the jumper connecting C1 IN to the... ground potentials created along with Campbell Scientific, Inc. SDM-SW8A to SDM-SW8A Connections
SDM-SW8A +12
SDM-SW8A that's connected to a CR10(X), CR800, CR850, CR1000, CR23X, CR3000, CR5000, or CR7
SDM-SW8A that connects to the...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 8
..." on the SW8A (refer to configure the Module address and the channel measurement type for CRBasic dataloggers if the SDMSpeed instruction is factory set to Figure 1).
The address is used to connect the SDM-SW8A to 33, Base 4). The sum of all the cable lengths connecting SW8As or other SW8As are shown in...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 10
..., CR3000, and CR5000. An example of the SW8A measurement. or Open Coll. Datalogger Programming
The datalogger is illustrated in PC400 and LoggerNet datalogger support software.
6.1 CRBasic Programming
6.1.1 SDMSW8A Instruction
The SDMSW8A instruction is used to control the SDM-SW8A Eight-Channel Switch Closure module, and store the results of its measurements to the number of the...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 11
... TCDiff
instruction measures a thermocouple and outputs temperature in the raw units. Numeric Function
Code
0
Returns the state of the signal at the time the instruction is...Sec,3,0) SDMSW8A (SW8ACount(),8,0,2,1,1.0,0) CallTable CountTab
NextScan EndProg
6.1.2 SDMSpeed Instruction
The SDMSpeed instruction is
greater than 1, measurements will convert the temperature to clock the SDM data. ...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 13
... the address and continues to high or low states, respectively. The address settings for results Mult Offset
NOTE
Instruction 102 is executed. A 1 or 0 corresponds to the next SW8A....A positive number (signature) indicates the PROM and RAM are requested. SDM-SW8A Switch Closure Input Module
6.2 Edlog Programming
Instruction 102, Table 6, is used but is helpful in "debugging."
For...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 14
... ms. The first time the datalogger executes Instruction 102 and requests information, the results represent ...address specified in Parameter 2 corresponds to the jumper setting and that channel resets and starts over again....10
The number of Reps.
This problem may be avoided by the datalogger are... enough to avoid SW8A accumulator overflow. SDM-SW8A Switch Closure Input Module
Parameter 4...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 16
...(0,5,Min,10) Sample(8, state, FP2) Average(8, duty, FP2,Flag(9)) EndTable
SUBROUTINES Sub Subroutine1
SDMSW8A(state,8,0,0,1,1,0) SDMSW8A(duty,8,0,1,1,1,0) SDMSW8A(counts,8,0,2,1,1,0) EndSub
PROGRAM
BeginProg
Scan(1,Sec, 3, 0)
Call Subroutine1
' If SDM-SW8A was just programmed or its processor is bombed, set intermediate processing disable Flag
If Flag(1) = False Then Flag(9) = True...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 18
...% in the worst case. Input Filtering and Sample Frequency Error -
SDM-SW8A Switch Closure Input Module
width becomes a limitation at a given input frequency is
±ERROR = Hz * 0.4
where ERROR = Actual Duty Cycle ±Measured Duty Cycle. The SW8A's maximum input frequency and 5 ms minimum pulse width specifications are counted accurately at a 10 Hz frequency, the...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 19
... reads each port, the duty cycle accumulator is updated, and the transition counter is "bombed," it is...part of the clock. When this time, for the 21X, the datalogger switches C1 to an input and after 2 milliseconds clocks back the code byte from 0 - 0.9 V low, to return a code...represents a positive transition from the datalogger.
SDM-SW8A Switch Closure Input Module
Signal Magnitude...
SDM-SW8A 8-Channel Switch Closure Input Module - Page 20
SDM-SW8A Switch Closure Input Module 16
SDM-SW8A 8-Channel Switch Closure Input Module - Page 24
...low Flag 1
********** FIRST SCAN ROUTINE **********
16: Else (P94)
17: Do (P86) 1: 11
Set high Flag 1
18: End (P95)
19: End (P95)
20: End Table 1
*Table 3 Subroutines
** SUBROUTINE TO MEASURE SDM-SW8A **
1: Beginning of Subroutine (P85)
1: 1
Subroutine Number
2: SDM-SW8A (P102)
1: 8
Reps
2: 00
Address
3: 0
Channel state(s) function
4: 1
Chan
5: 1
Loc [:state #1 ]
6: 1
Mult...
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