diff --git a/README.md b/README.md
index 9f14e02..cf8bb2d 100644
--- a/README.md
+++ b/README.md
@@ -70,3 +70,11 @@ Serial in | 4 | UART in to keyboard
 | 9 | Online LED |
 | 8 | Speaker |
 
+
+### Terminal DB25
+
+The VDX 52600 terminal uses the standard DB25 serial connector to connect to an RS-232 serial link. It is enough to connect pins (2) TX, (3) RX and (7) GND.
+See [RS-232 over DB25 connector](http://www.nullmodem.com/DB-25.htm) for more.
+
+By default the serial port configuration is 9600–8-N-1 (i.e. the standard baud rate of 9600). Connecting it to a serial port of a Linux machine works nicely.
+