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Appendix a: rs-232 connections - 57 – B&B Electronics ESP904 User Manual

Page 34

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RS-232

Connections

Manual Documentation Number: ESP904-0504

Appendix

57

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

A

A

P

P

P

P

E

E

N

N

D

D

I

I

X

X

A

A

:

:

R

R

S

S

-

-

2

2

3

3

2

2

C

C

O

O

N

N

N

N

E

E

C

C

T

T

I

I

O

O

N

N

S

S

ESP904 DB-9 Pin-outs in RS-232 Mode

RS-232

Signal Name

DTE RS-232 DB-9M

Pin

Carrier Detect

In

DCD

1

Receive Data

In

RXD

2

Transmit Data

Out

TXD

3

Data Terminal Ready

Out

DTR

4

Signal Ground

---

GND

5

Data Set Ready

In

DSR

6

Request To Send

Out

RTS

7

Clear To Send

In

CTS

8

Ring Indicator

In

RI

9

Figure 41. RS-232 Connections in a DB-9 Connector

RS-232

Connections

58

Appendix A

Manual Documentation Number: ESP904-0504

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

RS-232 Straight-through Cable Connections

In the RS-232 mode, the ESP904’s ports are configured as DTEs like a
computer. If the device connected to the ESP904 is configured as a DCE use
a straight through cable wired as shown below:

Figure 42. Straight-through (DTE to DCE) DB-9 to DB-9 Serial Cable

with RS-232 Signal Designations

RS-232 Crossover (null modem) Cable Connections

When connecting to a PC or another DTE device, use a crossover cable (also
called a null modem cable).

Figure 43. Crossover (DTE to DTE) DB-9 to DB-9 Serial Cable with

RS-232 Signal Designations

RS-232 Signal Names

DB-9

Pin#

Connections

DB-9

Pin#

Signal

Carrier Detect

CD

1

1

CD

Receive Data

RD

2

2

RD

Transmit Data

TD

3

3

TD

Data Terminal Ready

DTR

4

4

DTR

Signal

Ground/Common

GND 5

5 GND

Data Set Ready

DSR

6

6

DSR

Request to Send

RTS

7

7

RTS

Clear to Send

CTS

8

8

CTS

Ring Indicator

RI

9

9

RI

RS-232 Signal Names

DB-9

Pin#

Connections

DB-9

Pin#

Signal

Carrier Detect

CD

1

1

CD

Receive Data

RD

2

2

RD

Transmit Data

TD

3

3

TD

Data Terminal Ready

DTR

4

4

DTR

Signal Ground/Common

GND

5

5

GND

Data Set Ready

DSR

6

6

DSR

Request to Send

RTS

7

7

RTS

Clear to Send

CTS

8

8

CTS

Ring Indicator

RI

9

9

RI

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