Tektronix Keithley 7707 Instructions For Use Manual
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Tektronix Keithley 7707 Instructions For Use Manual

Tektronix Keithley 7707 Instructions For Use Manual

32-channel digital i/o module
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Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Introduction
The Model 7707 32-Channel Digital I/O Module with 10-channel Differential Multiplexer offers ten channels
of 2-pole or five channels of 4-pole multiplexer switching that can be configured as two independent banks of
multiplexers. The 7707 also provides 32 digital input/output channels (four 8-bit ports) for I/O control. The 7707
connects to industry standard solid-state relays to switch up to 125 VA.
Item shipped may vary from model pictured here.
The 7707 includes the following features:
300 V, 1 A capacity; 60 W, 125 VA maximum (analog)
33 V, 100 mA capacity (digital)
Digital outputs are short circuit protected
Relay closures stored in onboard memory
The 7707 switching module can be used with the DAQ6510 Data Acquisition and Multimeter System.
If you are using this switching module with the 2700, 2701, and 2750 instruments, please see Model
7707 User's Guide, Keithley Instruments document number PA-770.
077147400 / June 2018
Model 7707 32-Channel Digital I/O Module
Instructions for use with DAQ6510
Figure 1: Model 7707
*P077147400*
1

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  • Page 1 Model 7707 32-Channel Digital I/O Module Keithley Instruments Instructions for use with DAQ6510 28775 Aurora Road Cleveland, Ohio 44139 1-800-935-5595 tek.com/keithley Introduction The Model 7707 32-Channel Digital I/O Module with 10-channel Differential Multiplexer offers ten channels of 2-pole or five channels of 4-pole multiplexer switching that can be configured as two independent banks of multiplexers.

  • Page 2: Connection Information

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Connection information The 7707 is shipped with plastic connector covers installed on the D-shell connectors. Each cover is secured to the connector by two screws. After removing a connector cover, retain it and the screws for future use.

  • Page 3: Simplified Schematic

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Simplified schematic The following figure shows a simplified schematic diagram of the 7707 switching module. As shown, the 7707 has channels that are grouped into two banks of five channels (10 channels total). Backplane isolation is provided for each bank.
  • Page 4 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Figure 2: Simplified schematic for the 7707 077147400 / June 2018...

  • Page 5: Installation

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Installation Before operating an instrument with a switching module, verify that the switching module is properly installed and the mounting screws are tightly fastened. If the mounting screws are not properly connected, an electrical shock hazard may be present.
  • Page 6 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Before installing or removing a switching module, make sure the DAQ6510 power is turned off and disconnected from line power. Failure to comply may result in incorrect operation and loss of data in the memory.
  • Page 7 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Remove a switching module Before you remove a switching module or begin any testing, make sure that all the relays are open. Since some relays may be latched closed, you must open all the relays before removing the switching module to make connections.
  • Page 8 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Connections and wiring overview Connection and wiring procedures in this document are intended for use by qualified personnel only, as described by the types of product users in the Safety precautions page 33).
  • Page 9 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 50-pin D-shell (DB-50) 7707 terminal 7707 terminal Ch 11 Bit 2 Ch 13 Bit 2 Ch 11 Bit 5 Ch 13 Bit 5 Protection K1 Protection K3 Ch 12 Bit 1 Ch 14 Bit 1 Ch 12 Bit 4 Ch 14 Bit 4...
  • Page 10 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Fifty-pin ribbon cable connections The DB-50 connector is used for digital I/O connections. Do not exceed 40 V on any digital terminal in the test system. Connect an appropriate length of 50-conductor IDC ribbon cable to a 50-pin female D-shell IDC connector. The following table and figure provides terminal identification for the 50-pin ribbon cable connections.
  • Page 11 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 If the connector is not used, install a connector cover as shown in the following figure. Use two #4-40 screws. Figure 4: Connect DB-50 ribbon cable assembly Twenty-five-pin ribbon cable connections When using IDC ribbon cable for analog inputs (DB-25), do not exceed 42 V on any analog input (including front panel terminals of the instrument).
  • Page 12 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 The connectors of the prepared ribbon cable assemblies mate to the 25-pin D-shell connectors of the 7707, as shown in the following figure. 25-conductor IDC ribbon cable is available from Keithley. Figure 5: Connect 25-pin ribbon cable assembly If a D-shell connector is not used, make sure the connector has the connector cover installed, as shown in the following figure.
  • Page 13 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Solder cup cable connections Make all connections to D-shell male solder cup connectors using the correct wire size, up to 20 AWG. When using a solder cup cable on the DB-25, use supplementary insulation around the harness for voltages above 42 V , as shown in the following figure.

  • Page 14: Connection Log

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Connection log You can use the following tables to record connection information and channel descriptions as needed. Channel Color Description INPUT SENSE CH10 077147400 / June 2018...
  • Page 15 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Ch 11 Ch 12 line Color Color Bit 0 (B0) (B8) Bit 1 (B1) (B9) Bit 2 (B2) (B10) Bit 3 (B3) (B11) Bit 4 (B4) (B12) Bit 5 (B5) (B13) Bit 6...

  • Page 16: Analog Inputs

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Analog inputs The following 7707 channels are used to measure analog inputs:  Channels 1 to 10: Measurement channels  Channel 15: 2-pole/4-pole selection relay  Channels 16 and 17: Backplane isolation relays for sense and input Typical analog input connections The following examples show typical connections for the following types of measurements: ...
  • Page 17 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Figure 9: Four-wire resistance and RTD connections Figure 10: Voltage connections (AC or DC) 077147400 / June 2018...

  • Page 18: Digital Outputs

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Digital I/O The 7707 has four digital input/output channels (11, 12, 13, and 14). Each I/O channel can be set as either a digital input port or a digital output port. Each port has eight lines (bits 0 through 7). When an I/O channel is used as an input port, you can read the state (high or low) of each input line (bit).
  • Page 19 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Sink mode As a sink, current provided by an external source flows into the module when the output line is set low (logic 0). Using an output line as a sink provides control for high voltage (up to 40 V) or high current (up to 100 mA) devices, such as relays, solenoids, and other loads.
  • Page 20 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Figure 13: Typical digital output: Sink mode without K1 protection Figure 14: Typical digital output: Sink mode using external flyback diode protection 077147400 / June 2018...
  • Page 21 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Source mode When used as a source, current provided by the internal 5 V supply flows out of the module to a load when the output line is set high (logic 1). Using an output line as a source provides control for low voltage, low current (up to 1 mA) loads, such as logic devices and indicator lamps.

  • Page 22: Digital I/O Protection

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Digital I/O protection Short circuit protection Each digital output line has internal short circuit protection up to 25 V. Overcurrent protection is tripped at approximately 1 A. The following figure is a simplified circuit showing thermal protection for a digital output. A short circuit condition exists when the transistor switch for the digital output is closed (logic 0).
  • Page 23 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Output bit patterns A binary bit pattern is a series of 0s and 1s that identifies the state of each line in the pattern. A bit with a logic 1 is effectively equal to a line high at approximately +4.3 V.
  • Page 24 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 For remote programming, the following SCPI commands set the channel as an input or output channel, set the width, and set the 8-bit output pattern for each output port: ...
  • Page 25 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Advanced operation: Setting words (16-bits) or double-words (32-bits) Sixteen-bit output patterns (words) To set two output ports to form a 16-bit output pattern (word), you set the width of channel 11 or 13 to 2 and write to that channel.
  • Page 26 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Thirty-two-bit output pattern (double-word) To set the four output ports to form a 32-bit output pattern (double-word), you set the width of channel 11 to 4. Channel 11 is combined with channels 12, 13, and 14 to form the 32-bit output pattern. When channel 11 is set as a double-word, bit 0 of channel 11 (B0) is the LSB, and bit 7 of channel 14 (B31) is the MSB.

  • Page 27: Setting Digital Outputs

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Setting digital outputs Before setting a digital output pattern, an I/O channel must first be set as an output port. This must be done using remote programming. You can set 8-bit patterns (bytes), 16-bit patterns (words), and a 32-bit pattern (double-word).

  • Page 28: Digital Inputs

    Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Digital inputs You can read digital TTL inputs with the DAQ6510. With one I/O channel set as an input port, eight input lines (bits) are available. With two channels set as input ports, 16 input lines (bits) are available. With three channels set as input ports, 24 input lines (bits) are available.
  • Page 29 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Advanced operation: Reading words (16-bits) or double-words (32-bits) Sixteen-bit input patterns (words) Sixteen bits of data (two bytes) is called a word. You can read 16-bit patterns (words) formed by two input ports.
  • Page 30 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Thirty-two-bit input pattern (double-word) Thirty-two bits of data (two words) is called a double word. You can read a 32-bit pattern (double word) formed by four input ports. Channel 11 is combined with channels 12, 13, and 14 to form the 32-bit pattern. When channel 11 is read as a double-word, bit 0 (B0) of channel 11 is the LSB, and bit 7 (B31) of channel 14 is the MSB.
  • Page 31 Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510 Measurement considerations (digital outputs) The 7707 switching module provides thermal short circuit protection. That is, when a channel is programmed as an output, internal circuitry is protected from an inadvertent connection up to 1 A at 25 V. The protection on the 7707 consumes power at approximately 80 mA per channel or 320 mA per 7707 with all four channels (11 to 14 set as 32 bits) programmed as outputs.

  • Page 32: Factory Service

    Factory service To return the switching module to Keithley Instruments for repair:  Call the Repair Department at 1-800-833-9200 or send an email to RMAREQUEST@tektronix.com for a Return Material Authorization (RMA) number.  Carefully pack the instrument in the original packing carton.

  • Page 33: Safety Precautions

    Safety precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
  • Page 34 For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.

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