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Texas Instruments RS485-HF-DPLX-EVM User Manual Download Page 3

3.3V

PSU

1

2

3

TB1

NOTE: R2, R3, R4 - DNI

A_2

B_2

DE

D

B

/RE

R_1

R

A

DUT_VCC

EARTH_GND

DUT_GND

DUT_GND

EARTH_GND

DUT_GND

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

DUT_GND

DUT_VCC

DUT_GND

DUT_GND

EARTH_GND

DUT_GND

EARTH_GND

DUT_GND

EARTH_GND

DUT_VCC

DUT_VCC

DUT_VCC

DUT_VCC

VCM_B

VCM_A

DUT_GND

EARTH_GND

DUT_VCC

VCM_B

DUT_GND

EARTH_GND

EARTH_GND

DUT_GND

EARTH_GND

DUT_VCC

VCM_A

DUT_GND

VCM_A

VCM_B

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

EARTH_GND

DUT_GND

DUT_GND

DUT_VCC

DUT_GND

DUT_GND

DUT_GND

DUT_GND

DUT_GND

R7
UNINSTALLED

TB2

3PIN_TERMINAL_BLOCK

1

2

3

R2
50 Ohms

R3
50 Ohms

D3

RED LED Diode

1

2

D2
GREEN LED Diode

1

2

R4
50 Ohms

C1
1uF

R5
120 Ohm

JMP9

Header 4x1

1
2
3
4

U1

SN65HVD7x

R

1

/RE

2

DE

3

D

4

GND

5

A

6

B

7

VCC

8

R11
1k Ohms

C6
UNINSTALLED

C2
0.1uF

JMP12

Header 3x1

1

2

3

JMP14

Header 3x1

1

2

3

JMP4

Header 4x1

1
2
3
4

C4
1uF

C9

UNINSTALLED

JMP10

Header 4x1

1
2
3
4

C3

0.01uF

JMP2

Header 4x1

1
2
3
4

JMP8

Header 4x1

1
2
3
4

JMP3

Header 4x1

1
2
3
4

R6
UNINSTALLED

C7
UNINSTALLED

D1

BLUE LED Diode

1

2

C5
0.1uF

R14
1k Ohms

JMP7

Header 4x1

1
2
3
4

R1

1k Ohms

JMP13

Header 3x1

1

2

3

JMP1

Header 4x1

1
2
3
4

JMP6

Header 4x1

1
2
3
4

TB1

3PIN_TERMINAL_BLOCK

1

2

3

JMP11

Header 3x1

1

2

3

R9

0 Ohm

C8

UNINSTALLED

R8

0 Ohm

R10

0 Ohm

www.ti.com

EVM Setup and Precautions

Figure 1. RS-485 Half-Duplex EVM Schematic

For the first measurements, ignore the common-mode simulation and connect EARTH to GND through a
wire-bridge between pin 1 and pin 2 of TB1.

Figure 2. Bridging DUT_GND with EARTH_GND

While JMP2 to JMP4 are stimulation points, or headers through which the control and data signals for the
RS485 Half-Duplex EVM are applied, JMP1, and JMP11 to JMP14 are probe points, or headers at which
these signal can be measured.

Note that the 50-

Ω

resistors, R2, R3, and R4, have the index n.a., indicating that these components are

not assembled. Because signal generators have a typical source impedance of 50

Ω

, their output signal is

twice the required signal voltage, and assumes that the on-board 50-

Ω

resistors divide this voltage down

to the correct signal level.

3

SLLU173A – October 2012 – Revised November 2012

RS-485 Half-Duplex Evaluation Module

Submit Documentation Feedback

Copyright © 2012, Texas Instruments Incorporated

Summary of Contents for RS485-HF-DPLX-EVM

Page 1: ...gures 1 RS 485 Half Duplex EVM Schematic 3 2 Bridging DUT_GND with EARTH_GND 3 3 Example for Stimulus and Probe Points with JMP4 and JMP14 4 4 Transceiver Configuration for Normal Operation 5 5 RS 485 Half Duplex EVM Setup for Normal Transceiver Operation 5 6 Configuration for Maximum Loading 6 7 RS 485 Half Duplex EVM Setup for Maximum Loading 6 8 RS 485 Half Duplex EVM Configurations Left as Rec...

Page 2: ...VM See http www ti com tool rs485 hf dplx evm for more information 2 EVM Setup and Precautions Figure 1 shows the schematic of the EVM The EVM board has headers labeled from JMP1 to JMP14 JMP5 is omitted and two 3 pin terminal blocks labeled TB1 and TB2 These headers support device evaluation for a wide range of system configurations NOTE The examples in this document show a 3 3 V signal generator...

Page 3: ...LUE LED Diode 1 2 C5 0 1uF R14 1k Ohms JMP7 Header 4x1 1 2 3 4 R1 1k Ohms JMP13 Header 3x1 1 2 3 JMP1 Header 4x1 1 2 3 4 JMP6 Header 4x1 1 2 3 4 TB1 3PIN_TERMINAL_BLOCK 1 2 3 JMP11 Header 3x1 1 2 3 R9 0 Ohm C8 UNINSTALLED R8 0 Ohm R10 0 Ohm www ti com EVM Setup and Precautions Figure 1 RS 485 Half Duplex EVM Schematic For the first measurements ignore the common mode simulation and connect EARTH t...

Page 4: ... 2 Connect the oscilloscope with the respective probe points you want to measure 3 Adjust the power supply to match the VCC requirements of the selected RS 485 device 4 Adjust the generator outputs for a maximum output signal level based on the VCC requirements of your selected RS 485 device or check the logic switching levels of the controller I O 5 Connect the power supply conductor with pin 3 o...

Page 5: ...P2 and the high potential for DE through a wire bridge from pin 2 to pin 1 at JMP3 Data from the signal generator enter the board at pin 2 and pin 3 of JMP4 This data is measured via channel 1 which is connected to pin 1 and pin 2 of JMP14 Channel 2 measures the receive data at JMP11 and channels 3 and 4 the bus voltages VA and VB at JMP6 2 Operation Under Maximum Load EIA 485 RS 485 specifies thr...

Page 6: ...d to be implemented to reflect maximum load conditions replace R5 120 Ω default with 60 Ω replace R8 and R9 0 Ω default with 375 Ω connect pin 2 of JMP7 with pin 1 and pin 3 with pin 4 replace the previous wire bridge at TB1 with a second power supply unit PSU2 and connect the ground terminals of both PSU1 and PSU2 with a wire bridge as shown in Figure 7 Figure 7 RS 485 Half Duplex EVM Setup for M...

Page 7: ... RE DE 1 JMP14 2 3 1 2 3 TB1 GND EARTH VCC 1 2 3 TB2 B A 3 3V 3 3V www ti com Powering Up the EVM and Taking Measurements Figure 8 RS 485 Half Duplex EVM Configurations Left as Receiver EVM Right as Transmitter EVM Figure 9 Top View of RS 485 Half Duplex EVM 7 SLLU173A October 2012 Revised November 2012 RS 485 Half Duplex Evaluation Module Submit Documentation Feedback Copyright 2012 Texas Instrum...

Page 8: ...485 Half Duplex EVM For detailed information on the device parameters see the data sheet of the selected device at www ti com 8 RS 485 Half Duplex Evaluation Module SLLU173A October 2012 Revised November 2012 Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 9: ...ency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio frequency interference Operation of the equipment may cause interference with radio communications in which case the user at his own expense will be required to take whatever measures may be required t...

Page 10: ... its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this l...

Page 11: ...er you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product Also please do not transfer this product unless you give the same notice above to the transferee Please note that if you could not follow the instructions above you will be subject to penalties of Radio Law of Japan Texas Instruments Japan Limited address 24 1 Nishi Shi...

Page 12: ... property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads Any loads applied outside of the specified output range may result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Plea...

Page 13: ...regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures monitor failures and their consequence...

Page 14: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments RS485 HF DPLX EVM ...

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