RS-232 and other serial ports and interfaces  > Sun pinouts
Available on SUN computers since the SUN3 series (1988) to the current UltraSparc systems (RS423/RS232)
Pin Name Dir Description
1n/c- 
2TXD-->Transmit Data
3RXD<--Receive Data
4RTS-->Request to Send
5CTS<--Clear to Send
6DSR<--Data Set Ready
7GND-System Ground
8DCD<--Data Carrier Detect
9n/c-BUTTON_POR (Power-on reset) for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
10n/c-BUTTON_XIR_L (Transmit internal reset) for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
11n/c-+5 Vdc for Sun Ultra 80 / Sun Blade 1000 / Sun Blade 2000 / Sun Fire 280R / Enterprise 420R
12n/c- 
13n/c- 
14n/c- 
15TRxC<--Transmit Clock
16n/c- 
17RTxC<--Receive Clock
18n/c- 
19n/c- 
20DTR-->Data Terminal Ready
21n/c- 
22n/c- 
23n/c- 
24TxC-->Transmit Clock
25n/c- 
25 pin D-SUB female connector layout
25 pin D-SUB female connector
at the computer
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Sun Serial (DB25) visual pinout:
Sun Serial (DB25) diagram
click to enlarge
Source(s) of this and additional information: SUN SPARCengine Ultra 20 OEM Manual, from Hardware Book
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