Geokon 8032 User manual

INSTRUCTION MANUAL
MODEL 8032
TERMINAL BOARD AND 16/32 CHANNEL MULTIPLEXER
No part of this instruction manual may be reproduced, by any means, without the written consent of
Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes
no responsibility for errors, omissions or misinterpretation. The information herein is subject to change
without notification.
Copyright © 2015 by Geokon, Inc.
(Doc Rev H, 6/1)

Warranty Statement
Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under
normal use and service for a period of 13 months from date of purchase. If the unit should
malfunction, it must be returned to the factory for evaluation, freight prepaid. Upon examination
by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge.
However, the WARRANTY is VOID if the unit shows evidence of having been tampered with or
shows evidence of being damaged as a result of excessive corrosion or current, heat, moisture or
vibration, improper specification, misapplication, misuse or other operating conditions outside of
Geokon's control. Components which wear or which are damaged by misuse are not warranted.
This includes fuses and batteries.
Geokon manufactures scientific instruments whose misuse is potentially dangerous. The
instruments are intended to be installed and used only by qualified personnel. There are no
warranties except as stated herein. There are no other warranties, expressed or implied, including
but not limited to the implied warranties of merchantability and of fitness for a particular purpose.
Geokon, Inc. is not responsible for any damages or losses caused to other equipment, whether
direct, indirect, incidental, special or consequential which the purchaser may experience as a
result of the installation or use of the product. The buyer's sole remedy for any breach of this
agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the
purchase price paid by the purchaser to Geokon, Inc. for the unit or units, or equipment directly
affected by such breach. Under no circumstances will Geokon reimburse the claimant for loss
incurred in removing and/or reinstalling equipment.
Every precaution for accuracy has been taken in the preparation of manuals and/or software,
however, Geokon, Inc. neither assumes responsibility for any omissions or errors that may appear
nor assumes liability for any damages or losses that result from the use of the products in
accordance with the information contained in the manual or software.

TABLE of CONTENTS
1. THEORY OF OPERATION....................................................................................................................1
1.1 GK-403 MODE OF OPERATION ..............................................................................................................4
1.2 MICRO-800/MICRO-1000 MODE OF OPERATION ...............................................................................6
2. INSTALLATION AND WIRING............................................................................................................7
2.1 INSTALLATION.......................................................................................................................................7
2.2 WIRING..................................................................................................................................................7
2.3 DATALOGGER CONNECTION................................................................................................................10
3. MAINTENANCE ....................................................................................................................................10
4. TROUBLESHOOTING..........................................................................................................................11
APPENDIX A - SPECIFICATIONS .........................................................................................................12
APPENDIX B - CONNECTOR AND CABLE WIRING ........................................................................14
APPENDIX C - MANUAL SWITCH INSTRUCTIONS.........................................................................16
APPENDIX D –DAISYCHAIN OPERATION.......................................................................................17
APPENDIX E - MAXIMUM 8032-5 (TAN CABLE) CABLE LENGTHS............................................19
APPENDIX F –MEMS SENSOR TO MULTIPLEXER WIRING .......................................................20

LIST of FIGURES, TABLES and EQUATIONS
FIGURE 1-16 CHANNEL SWITCHING BLOCK DIAGRAM .................................................................................. 2
FIGURE 2-32 CHANNEL SWITCHING BLOCK DIAGRAM .................................................................................. 3
FIGURE 3-16 OR 32 CHANNEL SELECTION ..................................................................................................... 3
FIGURE 4–GK-403/DATALOGGER SELECTION.......................................................................................... 4
FIGURE 5-16 CHANNEL GK-403 CHANNEL SELECTION TIMING .................................................................... 4
FIGURE 6-32 CHANNEL GK-403 CHANNEL SELECTION TIMING .................................................................... 5
FIGURE 7-16 CHANNEL MICRO-800/MICRO-1000 CHANNEL SELECTION TIMING...................................... 6
FIGURE 8-32 CHANNEL MICRO-800/MICRO-1000 CHANNEL SELECTION TIMING...................................... 6
FIGURE 9-MULTIPLEXER ENCLOSURE MOUNTING DIMENSIONS.................................................................... 7
TABLE 1-16 CHANNEL MULTIPLEXER/TERMINAL BOARD WIRING................................................................ 8
TABLE 2-32 CHANNEL MULTIPLEXER/TERMINAL BOARD WIRING................................................................ 8
FIGURE 10-TERMINAL BOARD LAYOUT.......................................................................................................... 9
TABLE B.1 –J4 (I/O) CONNECTOR ................................................................................................................ 14
TABLE B.2 –P1 (I/O) CONNECTOR................................................................................................................ 14
TABLE B.3 –J1/J2 (TERMINAL BOARD)CONNECTORS.................................................................................. 15
FIGURE 11 -MANUAL SWITCH PANEL &ENCLOSURE................................................................................... 16
TABLE D.1 –DAISYCHAIN OPERATION/CHANNELS ACCESSED ..................................................................... 17
FIGURE D.1: DAISYCHAIN CONFIGURATION.................................................................................................. 18
FIGURE E.1: RECOMMENDED MAXIMUM CABLE LENGTH............................................................................. 19

1
1. THEORY OF OPERATION
The Model 8032 Terminal Board and Multiplexer expands the number of channels that
can be read by the MICRO-800 Datalogger, MICRO-1000 Datalogger or GK-403
Vibrating Wire Readout Box. Channel switching is accomplished by mechanical relays
mounted on the underside of the circuit board and the transducer connections are
accomplished by friction locking spring-loaded terminals mounted on the top side of the
circuit board.
There are two different varieties of 8032 board:
8032-E Terminal Board only –typically used in conjunction with a 4999 Manual
Switch Box
8032-C Terminal Board with Multiplexer –typically used with the Micro-800
Datalogger, MICRO-1000 Datalogger or GK-403 Readout Box.
Two switching configurations are supported, 16 channels of 4 conductors or 32 channels
of 2 conductors. For the 8032-C, these configurations are set by a DipSwitch on the top
side of the circuit board. A second DipSwitch selects whether the 8032-C is being used
with a datalogger or GK-403 Readout Box. For the 8032-E, these configurations are
determined by the 4999 Manual Switch Box.
To protect against lightning or EMI/RFI induced transients, each channel is protected by
an integrated lightning protection system, incorporating 230V tripolar plasma surge
arrestors, 150V bipolar plasma surge arrestors, 10uH inductors and 16V transient voltage
protection diodes. See Appendix A for complete specifications on these components.

2
Supported switching arrangements:
Relay
Control
Microcontroller
12V
GROUND
RESET
CLOCK
COM HI 1
COM LO 1
GK-403 or
CR800/CR1000
Sensor #1
12V
GROUND
RESET
CLOCK
Multiplexer/Terminal Board
AG
Sensor
Shield
COM HI 2
COM LO 2
Sensor #16
Sensor
Shield
1H
2H
1L
2L
S1
31H
32H
31L
32L
S16
Figure 1 - 16 Channel Switching Block Diagram
The 16 channel 4 wire switching configuration is typically used to multiplex 4 wire
sensors such as resistance strain gage load cells. It is also used to switch connections for
instruments which have more than one sensor integral to them, such as vibrating wire
pressure transducers with an integral thermistor for measuring temperature.

3
Relay
Control
Microcontroller
12V
GROUND
RESET
CLOCK
COM HI
COM LO
GK-403 or
CR800/CR1000
Sensor #1
Sensor #32
12V
GROUND
RESET
CLOCK
Multiplexer/Terminal Board
AG
Sensor
Shield
Sensor
Shield
1H
1L
S1
32H
32L
S16
Figure 2 - 32 Channel Switching Block Diagram
The 32 channel 2 wire switching configuration is typically used to multiplex 2 wire
sensors such as a vibrating wire pressure transducers, thermistors or thermocouples.
The multiplexer is powered by a nominal 12 VDC supply. Two control lines (RESET
and CLOCK) determine how channel selection is accomplished. Two schemes are
supported - one when connected to the GK-403 Vibrating Wire Readout Box and the
other when connected to MICRO-800 or MICRO-1000 dataloggers. See the following
sections explaining how each mode operates.
Figure 3 illustrates the DIP switch SW1 position 1 for switching between 16 and 32
channel operation. SW1 switch 1 ON = 32 channel, OFF = 16 channel. In Figure 3, 32
channel mode is chosen:
Figure 3 - 16 or 32 Channel Selection
ON
OFF
SW1
1
2
3
4

4
Figure 4 illustrates the DIP switch SW2 for switching between a GK-403 or Datalogger
application. “DATALOGGER”” is the default SW2 position:
Figure 4 –GK-403/DATALOGGER Selection
1.1 GK-403 Mode of Operation
The GK-403 mode of operation uses a single control line to select channels. This scheme
allows individual channels to be selected without having to sequentially advance through
all channels. Multiplexers can also be connected together in a daisy chain fashion using
the GK-403 protocol. In 16 channel mode, the number of clock pulses equals 2 times the
desired channel number. In 32 channel mode, the number of clock pulses equals the
desired channel number plus 1. Note the timing below for 16 and 32 channel switching
arrangements.
Clock
Channel 2
1
2
Timing:
T2 = min 20 usec
T3 = min 40 µsec (25kHz)
T1 = min 20 usec
Channel Selected
3
Channel 1
1
T4 = 500 µsec
2
T1
T2
T3
T4
4
Figure 5 - 16 Channel GK-403 Channel Selection Timing
GK-403
DATALOGGER
SW2