Serial Cable

From LinuxMIPS
Revision as of 02:35, 15 October 2005 by Sjlongland (Talk | contribs)

Jump to: navigation, search

This is the way you need to solder your cable.

Serial connector pinouts

Db9-serial.png

Minidin8-serial.png

Db25-serial.png

Name (V24) DB25 Pin# DB9 Pin# MiniDIN8 Pin# Direction Full Name Remarks
TxD 2 3 3 Out Transmit Data Data
RxD 3 2 5 In Receive Data Data
RTS 4 7 6 Out Request To Send Handshaking
CTS 5 8 2 In Clear To Send Handshaking
DTR 20 4 1 Out Data Terminal Ready Status
DSR 6 6 - In Data Set Ready Status
RI 22 9 - In Ring Indicator Status
DCD 8 1 7 In Data Carrier Detect Status
GND 7 5 4,8 - Signal ground Reference level
- 1 - - - Protective ground Don't use this one as signal ground!

How to connect the connectors

Null-modem Cable

This cable will allow you to hook the MiniDIN8 port directly up to a standard RS-232 port on another computer.

From MiniDin8 Pin --> To DB9 Pin DB25 Pin
DTR Data Terminal Ready Pin 1 --> DSR Data Set Ready Pin 6 Pin 6
CTS Clear To Send Pin 2 --> RTS Request To Send Pin 7 Pin 4
TD Transmit Data Pin 3 --> RD Receive Data Pin 2 Pin 3
SG Signal Ground Pins 4 & 8 --> SG Signal Ground Pin 5 Pin 7
RD Receive Data Pin 5 --> TD Transmit Data Pin 3 Pin 2
RTS Request To Send Pin 6 --> CTS Clear To Send Pin 8 Pin 5
DCD Data Carrier Detect Pin 7 --> DTR Data Terminal Ready Pin 4 Pin 20
Shield --> - Protective Ground - Pin 1

It it might be needed to have a connection between pin 20 and pin 8 on the Sub-D 25 connector to have your terminal do a carrier detect. SGI is using the same pin-pout for it's 8-pin mini-DIN connectors as Apple for it's machines. Therefor cables and adapters suitable for use with Apple system may be used.

Straight-Thru Cable

This cable will allow you to hook the MiniDIN8 port into an RS-232 device such as a modem.

From MiniDin8 Pin --> To DB9 Pin DB25 Pin
DTR Data Terminal Ready Pin 1 --> DTR Data Terminal Ready Pin 4 Pin 20
CTS Clear To Send Pin 2 --> CTS Clear To Send Pin 8 Pin 5
TD Transmit Data Pin 3 --> TD Transmit Data Pin 3 Pin 2
SG Signal Ground Pins 4 & 8 --> SG Signal Ground Pin 5 Pin 7
RD Receive Data Pin 5 --> RD Receive Data Pin 2 Pin 3
RTS Request To Send Pin 6 --> RTS Request To Send Pin 7 Pin 4
DCD Data Carrier Detect Pin 7 --> DCD Data Carrier Detect Pin 1 Pin 8
Shield --> - Protective Ground - Pin 1