Always have a breakout box on hand when building serial cables from scratch.

Direction

DTE
DB-25
Pin #

Abbr. NAME
--- 1 -- Protection/chassis/frame ground (ground to shell)
2 TxD Transmitted Data
3 RxD Received Data
4 RTS Request To Send
5 CTS Clear To Send
6 DSR Data Set Ready (aka DCE Ready)
--- 7 GND Signal Ground
8 DCD Data Carrier Detect (aka Carrier Detect/CD)
--- 9 -- Reserved
--- 10 -- Reserved for data set testing
--- 11 -- Unassigned
12 SCF Secondary Received Line Signal Detector
13 SCB Secondary Clear to Send
14 SBA Secondary Transmitted Data
15 DB Transmission Signal Element Timing (DCE Source
16 SBB Secondary Received Data
17 DD Receiver Signal Element Timing (DCE Source)
18 -- Local Loopback
19 SCA Secondary Request to Send
20 DTR Data Terminal Equipment Ready
21 CG Signal Quality Detector
22 -- Ring Indicator
23 CH/CI Data Signal Rate Selector
24 DA Transmit Signal Element Timing
25 -- Test Mode

Received by DTE
Transmitted by DTE

 


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