This is a MALE RS232 to TTL signal serial converter cable. The type I cable converts a serial signal to TTL with connections for Tx, Rx, +3V/5V and ground. The TTL connector is a 4-pin Friction Lock with a 0.100" pitch.
Female RS232 to TTL serial converter serial cable. The Type II cable converts a serial signal to TTL with cconnections for Tx, Rx, +3V/+5V and ground. The TTL connectors are two 2-pin connectors with one for power and one for signal. Replaces MCU-016-272