Difference between revisions of "CableCreation CD0486 USB to Female RS-232 Adapter"

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(changed order of pinout columns)
(updated pinout notes)
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== Wiring ==
 
== Wiring ==
  
This USB to RS-232 is configured as a DCE <i>not</i> a DTE, it is expecting to communicate with a DTE.
+
This USB to RS-232 is mostly configured as a DCE <i>not</i> a DTE, it is expecting to communicate with a DTE. <i>Mostly</i> because pins 1 and 9 have the wrong direction, they are not outputs, whether or not they are actually inputs needs to be verified...
  
 
{| class="wikitable"
 
{| class="wikitable"
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! Function
 
! Function
 
! Direction
 
! Direction
 +
! Note
 
|-
 
|-
 
| 1
 
| 1
 
| DCD
 
| DCD
 
| PC &larr; device
 
| PC &larr; device
 +
| supposed to be an output for DCE?
 
|-
 
|-
 
| 2
 
| 2
| TXD
+
| RXD
 
| PC &rarr; device
 
| PC &rarr; device
 +
|
 
|-
 
|-
 
| 3
 
| 3
| RXD
+
| TXD
 
| PC &larr; device
 
| PC &larr; device
 +
|
 
|-
 
|-
 
| 4
 
| 4
 
| DTR
 
| DTR
| PC &rarr; device
+
| PC &larr; device
 +
|
 
|-
 
|-
 
| 5
 
| 5
 
| GND
 
| GND
 
| PC &harr; device
 
| PC &harr; device
 +
|
 
|-
 
|-
 
| 6
 
| 6
 
| DSR
 
| DSR
| PC &larr; device
+
| PC &rarr; device
 +
|
 
|-
 
|-
 
| 7
 
| 7
 
| RTS
 
| RTS
| PC &rarr; device
+
| PC &larr; device
 +
|
 
|-
 
|-
 
| 8
 
| 8
 
| CTS
 
| CTS
| PC &larr; device
+
| PC &rarr; device
 +
|
 
|-
 
|-
 
| 9
 
| 9
 
| RI
 
| RI
 
| PC &larr; device
 
| PC &larr; device
 +
| supposed to be an output for DCE?
 
|-
 
|-
 
| (shield)
 
| (shield)
 
| shield
 
| shield
 
| PC &harr; device
 
| PC &harr; device
 +
|
 
|}
 
|}
  

Revision as of 07:43, 12 February 2024

stock photo
pinout

Overview

USB to RS-232 with female DE9 plug (male jackscrews) amd a DCE pinout, not normally found on a PC that would typically have a male DE9 DTE pinout. When DCE is needed though, this adapter would make a null modem (crossover) cable unnecessary. If needed a DTE pinout though, you would have to go back to using a null model cable...

Wiring

This USB to RS-232 is mostly configured as a DCE not a DTE, it is expecting to communicate with a DTE. Mostly because pins 1 and 9 have the wrong direction, they are not outputs, whether or not they are actually inputs needs to be verified...

DE9 Pin Function Direction Note
1 DCD PC ← device supposed to be an output for DCE?
2 RXD PC → device
3 TXD PC ← device
4 DTR PC ← device
5 GND PC ↔ device
6 DSR PC → device
7 RTS PC ← device
8 CTS PC → device
9 RI PC ← device supposed to be an output for DCE?
(shield) shield PC ↔ device

For more pin function information, see these Wikipedia pages:

Serial port - Wikipedia (Pinouts section)

RS-232 - Wikipedia

Online Resources

CableCreation USB to RS232 Serial Adapter (FTDI Chip), 6.6 Feet USB to DB9 Female Converter Cable | Amazon