Tektronix Keithley 7707 User manual

Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Model 7707 32-Channel Digital I/O Module
Instructions for use with DAQ6510
077147400 / June 2018 *P077147400*1
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.
Figure 1: Model 7707
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.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
2 077147400 / June 2018
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. Any unused D-shell connector must have the connector cover installed.
The 7707 is supplied with one 50-pin female IDC ribbon cable connector and one 25-pin male IDC ribbon
cable connector. These ribbon cable connectors mate to the D-shell connectors of the switching module.
When using IDC ribbon cable connections on the DB-25 (analog inputs), do not exceed 42 V
on any analog input in the test system (including the front panel inputs of the instrument).
For higher voltage applications (up to 300 V), use wire rated for the application and add
supplementary insulation to the wire harness, as shown in Solder cup cable connections
(on page 13).
The DB-50 connector is used for digital I/O connections. Do not exceed 40 V on any digital
terminal in the test system.
There are two connector kits that have connectors that can be used with the 7707:
Model 7790 ribbon cable adapter kit: Contains one female DB-50, one male DB-50, and one male
DB-25 IDC ribbon cable connector. The female DB-50 and the male DB-25 mate to the D-shell connectors
on the 7707.
Model 7789 50/25-pin solder cup connector kit: Contains one male DB-50 and one male DB-25 solder
cup connector. The male DB-25 mates to the 25-pin D-shell on the 7707.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 3
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. The first bank contains channels 1 to 5, while the second bank contains channels 6 to
10. Each channel of the 10-channel multiplexer card is wired with separate inputs for HI/LO, providing fully
isolated inputs.
Although the 7707 relays are latching type (relays hold their state even after power has been
removed), all relay states are set to open a few seconds after either a power cycle or an *RST
command is issued.
Connections to DMM functions are provided through the card backplane connector for INPUT connections
and SENSE (4-wire Ω) connections.
Channel 15 (2-wire/4-wire configuration), channel 16 (sense isolation), and channel 17 (input isolation) are
automatically configured during normal channel operation. When channel 15 is closed, channels 1 to 5 are
isolated from channels 6 to 10. When a 4-wire function is selected, the channels are paired as follows:
CH1 and CH6
CH2 and CH7
CH3 and CH8
CH4 and CH9
CH5 and CH10
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 to 7).
When an I/O channel is used as an input port, you can read the high or low state of each input line (bit).
When an I/O channel is used as an output port, you can set each line high or low to control external circuitry.
In the following schematic, channels 15 to 17 refer to the designations used for control and are not
available channels.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
4 077147400 / June 2018
Figure 2: Simplified schematic for the 7707

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 5
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.
If you are installing a 7707 and a 7708, the 7707 must be installed in slot 1 and the 7708 in slot 2 to
reduce measurement uncertainty. If you are installing two switching modules, it is easier to install one
switching module into slot 2 first, then install the second switching module into slot 1.
If you have a Keithley Instruments Model 2700, 2701, or 2750 instrument, you can use your existing
switching module in the DAQ6510. Follow the instructions in your original equipment documentation
to remove the module from the instrument, then use the following instructions to install it in the
DAQ6510. You do not need to remove wiring to the module.
For inexperienced users, it is recommended that you do not connect a device under test (DUT) and
external circuitry to the switching module. This allows you to exercise close and open operations
without the dangers associated with live test circuits. You can also set up pseudocards to experiment
with switching. Refer to "Pseudocards" in the Model DAQ6510 Data Acquisition and Multimeter
System Reference Manual for information on setting up pseudocards.
To prevent electric shock that could result in injury or death, never handle a switching
module that has power applied to it. Before installing or removing a switching module, make
sure the DAQ6510 is turned off and disconnected from line power. If the switching module is
connected to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
6 077147400 / June 2018
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.
Required equipment:
Medium flat-blade screwdriver
Medium Phillips screwdriver
To install a switching module into the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to remove the slot cover screws and the cover plate. Retain the plate and screws for
future use.
6. With the top cover of the switching module facing up, slide the switching module into the slot.
7. Press the switching module in firmly to make sure the switching module connector is connected to the
DAQ6510 connector.
8. Use the screwdriver to tighten the two mounting screws to secure the switching module to the mainframe.
Do not overtighten.
9. Reconnect the power cord and any other cables.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 7
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. Additionally, if you drop your switching module, it is possible
for some relays to latch closed.
To open all channel relays, go to the CHANNEL swipe screen. Select Open All.
To prevent electric shock that could result in injury or death, never handle a switching
module that has power applied to it. Before installing or removing a switching module, make
sure the DAQ6510 is turned off and disconnected from line power. If the switching module is
connected to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.
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.
Required equipment:
Medium flat-blade screwdriver
Medium Phillips screwdriver
To remove a switching module from the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to loosen the mounting screws that secure the switching module to the instrument.
6. Carefully remove the switching module.
7. Install a slot plate or another switching module in the empty slot.
8. Reconnect the power cord and any other cables.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
8 077147400 / June 2018
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 (on
page 33). Do not perform these procedures unless qualified to do so. Failure to recognize
and observe normal safety precautions could result in personal injury or death.
To prevent electric shock that could result in serious injury or death, adhere to the following safety precautions:
Before removing or installing the switching module in the mainframe, make sure the mainframe is turned
off and disconnected from line power.
Before making or breaking connections to the switching module, make sure power is removed from all
external circuitry.
Do not connect signals that may exceed the maximum specifications of the 7707.
The following figure shows the pin numbers for the 7707 rear-panel connectors. Use the 50-pin D-shell to
access digital input/output channels. Use the 25-pin D-shell to access analog input channels. Terminal
identification for the D-shell connector pins is provided in the following table.
Figure 3: 7707 rear panel D-shell connector pinouts

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 9
50-pin D-shell (DB-50)
Pin
7707 terminal
Pin
7707 terminal
1
Gnd
26
Gnd
2
Ch 11 Bit 2
27
Ch 13 Bit 2
3
Ch 11 Bit 5
28
Ch 13 Bit 5
4
Protection K1
29
Protection K3
5
Gnd
30
Gnd
6
Ch 12 Bit 1
31
Ch 14 Bit 1
7
Ch 12 Bit 4
32
Ch 14 Bit 4
8
Ch 12 Bit 7
33
Ch 14 Bit 7
9
Gnd
34
Ch 11 Bit 0
10
Ch 13 Bit 0
35
Ch 11 Bit 3
11
Ch 13 Bit 3
36
Ch 11 Bit 6
12
Ch 16 Bit 6
37
Gnd
13
Gnd
38
Gnd
14
Gnd
39
Ch 12 Bit 2
15
Ch 14 Bit 2
40
Ch 12 Bit 5
16
Ch 14 Bit 5
41
Protection K2
17
Protection K4
42
Gnd
18
Ch 11 Bit 1
43
Ch 13 Bit 1
19
Ch 11 Bit 4
44
Ch 13 Bit 4
20
Ch 11 Bit 7
45
Ch 13 Bit 7
21
Gnd
46
Gnd
22
Ch 12 Bit 0
47
Ch 14 Bit 0
23
Ch 12 Bit 3
48
Ch 14 Bit 3
24
Ch 12 Bit 6
49
Ch 14 Bit 6
25
Gnd
50
Gnd
25-pin D-shell (DB-25)
Pin
7707 terminal
Pin
7707 terminal
1
Ch 1 Hi
14
Ch 1 Lo
2
Ch 2 Hi
15
Ch 2 Lo
3
Ch 3 Hi
16
Ch 3 Lo
4
Ch 4 Hi
17
Ch 4 Lo
5
Ch 5 Hi
18
Ch 5 Lo
6
Ch 6 Hi
19
Ch 6 Lo
7
Ch 7 Hi
20
Ch 7 Lo
8
Ch 8 Hi
21
Ch 8 Lo
9
Ch 9 Hi
22
Ch 9 Lo
10
Ch 10 Hi
23
Ch 10 Lo
11
Sense Hi
24
Sense Lo
12
Input Hi
25
Input Lo
13
—

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
10 077147400 / June 2018
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.
The connectors of the prepared ribbon cable assembly mates to the 50-pin D-shell connectors of the 7707.
Make sure an unused D-shell connector has the connector cover installed.
50-conductor IDC ribbon cable is available from Keithley.
Terminal identification for 50-conductor IDC ribbon cable and 7707 DB-50 connector
Ribbon cable
7707
terminal
DB-50
pin #
Ribbon cable
7707
terminal
DB-50
pin #
Conductor
Color
Conductor
Color
1
Brown
Gnd
1
26
Blue
Gnd
42
2
Red
Ch 11 Bit 0
34
27
Violet
Gnd
26
3
Orange
Ch 11 Bit 1
18
28
Gray
Ch 13 Bit 0
10
4
Yellow
Ch 11 Bit 2
2
29
White
Ch 13 Bit 1
43
5
Green
Ch 11 Bit 3
35
30
Black
Ch 13 Bit 2
27
6
Blue
Ch 11 Bit 4
19
31
Brown
Ch 13 Bit 3
11
7
Violet
Ch 11 Bit 5
3
32
Red
Ch 13 Bit 4
44
8
Gray
Ch 11 Bit 6
36
33
Orange
Ch 13 Bit 5
28
9
White
Ch 11 Bit 7
20
34
Yellow
Ch 13 Bit 6
12
10
Black
Protection K1
4
35
Green
Ch 13 Bit 7
45
11
Brown
Gnd
37
36
Blue
Protection K3
29
12
Red
Gnd
21
37
Violet
Gnd
13
13
Orange
Gnd
5
38
Gray
Gnd
46
14
Yellow
Gnd
38
39
White
Gnd
30
15
Green
Ch 12 Bit 0
22
40
Black
Gnd
14
16
Blue
Ch 12 Bit 1
6
41
Brown
Ch 14 Bit 0
47
17
Violet
Ch 12 Bit 2
39
42
Red
Ch 14 Bit 1
31
18
Gray
Ch 12 Bit 3
23
43
Orange
Ch 14 Bit 2
15
19
White
Ch 12 Bit 4
7
44
Yellow
Ch 14 Bit 3
48
20
Black
Ch 12 Bit 5
40
45
Green
Ch 14 Bit 4
32
21
Brown
Ch 12 Bit 6
24
46
Blue
Ch 14 Bit 5
16
22
Red
Ch 12 Bit 7
8
47
Violet
Ch 14 Bit 6
49
23
Orange
Protection K2
41
48
Gray
Ch 14 Bit 7
33
24
Yellow
Gnd
25
49
White
Protection K4
17
25
Green
Gnd
9
50
Black
Gnd
50

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 11
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). When using IDC ribbon cable for the
digital I/O (DB-50), do not exceed 40 V on any digital terminal.
Connect an appropriate length of 25-conductor IDC ribbon cable to a 25-pin male D-shell IDC connector.
The following table and figure provide terminal identification for the 25-pin ribbon cable connections.
Terminal identification for 25-conductor IDC ribbon cable and 7707 DB-25 connector
Ribbon cable 7707
terminal DB-25 pin #
Ribbon cable 7707
terminal DB-25 pin #Conductor Color Conductor Color
1 Brown Ch 1 Hi 1 14 Yellow Ch 7 Lo 20
2 Red Ch 1 Lo 14 15 Green Ch 8 Hi 8
3 Orange Ch 2 Hi 2 16 Blue Ch 8 Lo 21
4 Yellow Ch 2 Lo 15 17 Violet Ch 9 Hi 9
5 Green Ch 3 Hi 3 18 Gray Ch 9 Lo 22
6 Blue Ch 3 Lo 16 19 White Ch 10 Hi 10
7 Violet Ch 4 Hi 4 20 Black Ch 10 Lo 23
8 Gray Ch 4 Lo 17 21 Brown Sense Hi 11
9 White Ch 5 Hi 5 22 Red Sense Lo 24
10 Black Ch 5 Lo 18 23 Orange Input Hi 12
11 Brown Ch 6 Hi 6 24 Yellow Input Lo 25
12 Red Ch 6 Lo 19 25 Green — —
13 Orange Ch 7 Hi 7

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
12 077147400 / June 2018
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.
Figure 6: DB-25 connector cover

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 13
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 VPEAK, as shown in the following figure.
For analog inputs (DB-25), all solder cup wiring must be rated for the maximum voltage in
the system. For example, if 300 V is applied to the front terminals of the DMM, all wiring for
analog inputs must be rated for 300 V.
For the digital I/O (DB-50), wiring must be rated for the maximum voltage applied to a digital
terminal (up to 40 V).
A connector cover must be installed on an unused 50-pin D-shell connector. If the connector
is left open, an electrical shock hazard may be present.
Figure 7: Connect the solder cup cable assembly

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
14 077147400 / June 2018
Connection log
You can use the following tables to record connection information and channel descriptions as needed.
Channel Color Description
INPUT H
L
SENSE H
L
CH1 H
L
CH2 H
L
CH3 H
L
CH4 H
L
CH5 H
L
CH6 H
L
CH7 H
L
CH8 H
L
CH9 H
L
CH10 H
L

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 15
I/O
line
Ch 11
Ch 12
In
Out
Color
In
Out
Color
Bit 0
(B0)
0 1
(B8)
0 1
Bit 1
(B1)
0 1
(B9)
01
Bit 2
(B2)
0 1
(B10)
0 1
Bit 3
(B3)
0 1
(B11)
0 1
Bit 4
(B4)
0 1
(B12)
0 1
Bit 5
(B5)
0 1
(B13)
0 1
Bit 6
(B6)
0 1
(B14)
0 1
Bit 7
(B7)
0 1
(B15)
0 1
0 = low, 1 = high
I/O
line
Ch 13
Ch 14
In
Out
Color
In
Out
Color
Bit 0
(B16)
0 1
(B24)
0 1
Bit 1
(B17)
0 1
(B25)
0 1
Bit 2
(B18)
0 1
(B26)
0 1
Bit 3
(B19)
0 1
(B27)
0 1
Bit 4
(B20)
0 1
(B28)
0 1
Bit 5
(B21)
0 1
(B29)
0 1
Bit 6
(B22)
0 1
(B30)
0 1
Bit 7
(B23)
0 1
(B31)
0 1
0 = low, 1 = high

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
16 077147400 / June 2018
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:
Two-wire resistance and thermistor
Four-wire resistance and RTD
DC or AC voltage
Figure 8: Two-wire resistance and thermistor connections

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 17
Figure 9: Four-wire resistance and RTD connections
Figure 10: Voltage connections (AC or DC)

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
18 077147400 / June 2018
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).
When an I/O channel is used as an output port, you can set each line high or low to control external circuitry.
Figure 11: 7707 Digital I/O
Digital outputs
You can use digital outputs to control devices such as logic devices, indicators, fixtures, switches, solenoids,
loads, and relays. With one I/O channel set as an output port, eight output lines (bits) are available. With two
channels set as output ports, 16 output lines are available. With three channels set as output ports, 24 output
lines are available. With all four channels set as output ports, 32 output lines are available.
An output line can be set high to ≈4.3 V or low to 0 V (digital ground). Output lines are set as follows:
Logic 0 sets output line low to 0 V (digital ground).
Logic 1 sets output line high to ≈4.3 V.
You must configure a digital I/O channel as an output port before its output lines can be set high
or low.
Sink or source
You can use a digital output line as a sink for an external source up to 40 V or as a ≈4.3 V source for a
low-current device.

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
077147400 / June 2018 19
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. The following figures show how to use an output line
as a sink.
Do not apply more than +40 V to the K1, K2, K3, and K4 pins of the module. For the output
lines, do not exceed the maximum sink current. The maximum sink current for an output line
is 100 mA. Exceeding these limits may cause damage to the instrument that is not covered by
the warranty.
Figure 12: Typical digital output: Sink mode with K1 protection

Model 7707 32-Channel Digital I/O Module Instructions for use with DAQ6510
20 077147400 / June 2018
Figure 13: Typical digital output: Sink mode without K1 protection
Figure 14: Typical digital output: Sink mode using external flyback diode protection