Tektronix KTTI-RS232 Communication,Digital I/O Accessory Instruction Sheet User manual

Keithley Instruments

KTTI-RS232 Communication and Digital I/O

28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595

tek.com/keithley

Accessory Instruction Sheet

Introduction

The KTTI-RS232 Communication and Digital I/O Accessory provides instruments with an accessory card slot
with an RS-232 interface.

The card provides six independently configurable digital input/output lines that can be used to control external
digital circuitry, for example, a handler that is used to perform binning operations. The digital I/O port is a
standard female DB-9 connector. You can also use these lines for triggering. The instrument can generate
output trigger pulses and detect input trigger pulses.

Figure 1: KTTI-RS232 communications card

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The item shipped may vary from model pictured.

KTTI-RS232 Communication and Digital I/O Accessory Instruction Sheet

General specifications

General ratings for the KTTI-RS232 are lis ted in the fol low ing tab le.

Category Specification
Serial interface I/O connector: DB-9, female connector
Compliance Conforms to European Union EMC Directive

Compliance with CE and NRTL listed to UL61010-1 and UL61010-2-30
Conforms with European Union Low Voltage Directive

Environmental conditions I/O connector: DB-9, female connector

Operating temperature: 0 °C (32 °F) to 55 °C (131 °F)
Storage temperature: –20 °C (–4 °F) to 80 °C (176 °F)
Relative humidity: 5% to 95%, noncondensing
Power consumption: +5.0 V: 250 mA (typical), 300 mA (maximum)
Dimensions, (not including connectors): 120 mm (4.72 in.) x 64.5 mm

(2.54 in.)

Digital I/O Connector: 9-pin female D.

5V Power Supply Pin: Limited to 500 mA at > 4 V (solid-state fuse protected).
Lines: Six input/output, user-defined, for digital I/O or triggering.
Input Signal Levels: 0.7 V (maximum logic low), 3.7 V (minimum logic high).
Input Voltage Limits: –0.25 V (absolute minimum), +5.25 V (absolute

maximum).

Maximum Source Current: +2.0 mA at >2.7 V (per pin).
Maximum Sink Current: –50 mA at 0.7 V (per pin, solid-state fuse protected).

Environmental conditions Operating environment: Temperature 23 ºC ± 5 ºC, 5% to 80% relative

humidity, noncondensing

Storage environment: –25 ºC to 65 ºC

Unpack and inspect

Make sure to handle the KTTI-RS232 carefully. Always grasp the card by the side edges. Do not touch board
surfaces, components, or areas adjacent to electrical contacts. Contamination from foreign materials such as
dirt, dust, and body oils can substantially degrade card performance.

To unpack and inspect your instrumen t:

1. Inspect the box for damage.

2. Open the box.

3. Remove the card and inspect for any obvious signs of physical damage.

4. Report any damage to the shipping agent im mediately.

Installation

Slot covers must be installed on unused slots to prevent personal contact with high-voltage
circuits. Failure to recognize and observe standard safety precautions could result in
personal injury or death due to electric shock.

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KTTI-RS232 Communication and Digital I/O Accessory Instruction Sheet

To install the communications car d :

1. Turn the instrument off and disconnect the power line cord and any other cables connected to the rear
panel.

2. Position the instrument so that you are facing the rear panel.

3. Remove the slot cover plate from the slot on the back of the instrument. Retain the plate and screws for
future use.

4. Align the card with the connector toward the inside edge of the slot and slide the card into the chassis. For
the last ¼ inch, press in firmly to mate the card to the connector.

5. On each side of the card, there is a spring-loaded mounting screw. Tighten these two screws, either by
hand or with a Phillips-head screwdriver, to secure the card in the case. Do not overtighten.

6. Reconnect the power line cable and any other cables to the rear panel.

7. Turn on the instrument.

Making connections

The RS-232 serial port can be connected to the serial port of a controller using a straight-through RS232 cable
terminated with DB-9 connectors. Do not use a null modem cable.

The serial port uses the transmit (TXD), receive (RXD), and signal ground (GND) lines of the RS232 standard.
The figure below shows the rear panel connector for the RS232 interface. The table below shows the pinouts
for the connector.

Figure 2: KTTI-RS232 panel view

Figure 3: RS-232 panel connector

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KTTI-RS232 Communication and Digital I/O Accessory Instruction Sheet

Pin Description

1 No connection
2 TXD, transmit data
3 RXD, receive data
4 No connection
5 GND, signal ground
6 No connection
7 No connection
8 No connection
9 No connection

Operation

This section provides information needed to use the KTTI-RS232.
When the communications card is installed, the instrument recognizes the card when the power is turned on.
The KTTI-RS232 interface transfers data using eight data bits, one stop bit, and no parity. Make sure the

device you connect to the instrument also uses these settings .
You can break data transmissions by sending the ^C or ^X character string. This clears any pending operations

and discards any pending output.
Refer to the instrument reference manual for information about controlling the instrument from a remote

interface.

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KTTI-RS232 Communication and Digital I/O Accessory Instruction Sheet

Configuration

The baud rate is the rate at which the instrument and the attached device communicate. The factory-selected
baud rate is 9600, but you can choose from any of these available rates.

 115200
 57600
 38400
 19200
 9600
 4800
 2400
 1200
 600
 300

When you choose a baud rate, make sure the attached device can support the selected rate. The instrument
and the attached device must be configured for the same baud rate.

To configure the RS-232 card:

1. Press the MENU key.

2. Select Communication.

3. Set the Baud Rate option.

4. Set Flow Control.

Digital I/O

The KTTI-RS232 digital I/O port provides six independently configurable digital input/output lines.
You can use these lines for digital control by writing a bit pattern to the digital I/O lines. Digital control is used

for applications such as providing binning codes to a component handler. Digital control uses the state of the
line to determine the action to take.

You can also use these lines for triggering by using the transition of the line state to initiate an action. The
instrument can generate output trigger pulses and detect input trigger pulses. Triggering is used for applications
such as synchronizing the operations of a measurement instrument with the operations of other instruments.

You cannot configure or directly control the digital I/O lines from the front panel. To configure and control any of
the six digital input/output lines, you need to send commands to the KTTI-RS232 over a remote interface. You
can use either the SCPI or TSP command set.

See Remote communications interfaces in the instrument reference manual for information about setting up a
remote interface and choosing a command set.

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KTTI-RS232 Communication and Digital I/O Accessory Instruction Sheet

Digital I/O connector and pinout s

The digital I/O port uses a standard female DB-9 connector, located on the rear panel of the KTTI-RS232. You
can connect to the KTTI-RS232 digital I/O using a standard male DB-9 connector. The port provides a
connection point to each of the six digital I/O lines and other connections, as shown in the following table.

Figure 4: Digital I/O communication port

KTTI-RS232 digital I/O port pinouts
Pin Description

1 I/O line #1
2 I/O line #2
3 I/O line #3
4 I/O line #4
5

6 I/O line #5
7 +5 V line. Use this pin to drive external logic circuitry. Maximum

8 I/O line #6
9 Ground

line (relay flyback diode protection; maximum 33 V)

V

ext

current output is 500 mA. This line is protected by a
self-resetting fuse (one-hour recovery time).

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