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25 pin D-SUB female connector layout
25 pin D-SUB female connector
at the computer
Available on SUN computers since the SUN3 series (1988) to the current UltraSparc systems (RS423/RS232)
Pin Name Dir Description
1 n/c -  
2 TXD --> Transmit Data
3 RXD <-- Receive Data
4 RTS --> Request to Send
5 CTS <-- Clear to Send
6 DSR <-- Data Set Ready
7 GND - System Ground
8 DCD <-- Data Carrier Detect
9 n/c - BUTTON_POR (Power-on reset) for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
10 n/c - BUTTON_XIR_L (Transmit internal reset) for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
11 n/c - +5 Vdc for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
12 n/c -  
13 n/c -  
14 n/c -  
15 TRxC <-- Transmit Clock
16 n/c -  
17 RTxC <-- Receive Clock
18 n/c -  
19 n/c -  
20 DTR --> Data Terminal Ready
21 n/c -  
22 n/c -  
23 n/c -  
24 TxC --> Transmit Clock
25 n/c -  
Note: Direction is DTE (Computer) relative DCE (Modem)
Pinout status: +1 -0
According to 1 reports in our database (1 positive and 0 negative) the Sun Serial (DB25) pinout should be correct.

Is this pinout
NO DIY devices
Source(s) of this and additional information: SUN SPARCengine Ultra 20 OEM Manual, from Hardware Book
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