- 9 PIN SERIAL CONNECTOR PINOUT FULL
- 9 PIN SERIAL CONNECTOR PINOUT PC
This section is largely adapted from a posting on Vintage Computer Forums by “vwestlife”.
9 PIN SERIAL CONNECTOR PINOUT PC
IBM PC DB25 Pinout (including current loop)
The signal names used in most diagrams are usually named from the perspective of the DTE device.
9 pin DCE devices transmit on pin 2 and receive on pin 3. 9 pin DTE devices transmit on pin 3 and receive on pin 2. 25 pin DCE devices transmit on pin 3 and receive on pin 2. 25 pin DTE devices transmit on pin 2 and receive on pin 3. D-sub connectors follow another rule for pin assignment. Usually the DTE device is the terminal (or a computer emulating a terminal), and the DCE is a modem or another carrier-owned device.Ī general rule is that DCE devices provide the clock signal (internal clocking) and the DTE device synchronizes on the provided clock (external clocking). This section is largely adapted from Wikipedia’s Data Terminal Equipment page. Lowest speed supported is 300 baud (110 baud fails). ROM 5.2 assumes 7 data bits, 1 stop bit, odd parity. Pin 6 is hardwired to +12V via a 4.7K resistor. On JB3 or JB4, this means the first 13 jumpers are (starting from PCB edge): O, O, C, O, C, O, C, O, C, O, C, O, C. This configuration assumes the “Modem” (not “Terminal”) jumpers are installed. This image shows the pinouts of the DB25 connector from a DTE’s perspective -> V.24/RS-232 Interface Computer / Device 
The table below shows the serial port pinout on some devices I have needed to make cables for.
9 PIN SERIAL CONNECTOR PINOUT FULL
The full description of the DB25 pinouts (including rarely used signals) is shown in the table about one-quarter of the way down this page -> RS232 on DB25 Pinout (RS-232C)
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