Serial Cable
From LinuxMIPS
Revision as of 12:40, 11 September 2005 by Sjlongland (Talk | contribs)
This is the way you need to solder your cable.
Serial connector pinouts
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Name (V24) 25pin 9pin 8pin Dir Full name Remarks
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TxD 2 3 3 o Transmit Data Data
RxD 3 2 5 i Receive Data Data
RTS 4 7 6 o Request To Send Handshaking
CTS 5 8 2 i Clear To Send Handshaking
DTR 20 4 1 o Data Terminal Ready Status
DSR 6 6 - i Data Set Ready Status
RI 22 9 - i Ring Indicator Status
DCD 8 1 7 i 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
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DTR - Data Terminal Ready 1 | 6 DSR - Data Set Ready
CTS - Clear To Send 2 | 4 RTS
TD - Transmit Data 3 | 3 RD
SG - Signal Ground 4,8 | 7 SG
RD - Receive Data 5 | 2 TD
RTS - Request To Send 6 | 5 CTS
DCD - Data Carrier Detect 7 | 20 DTR
Shield | 1 Protective Ground
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.
