66UBI EasyCoder 101 – Technical ManualRS 232C (V24) is the most common interface for serial communi-cation with computers over short distances. The transmission canonly take place between one transmitter and one receiver. The mostsimple form of two-way communication only requires a 3-wirecable. The maximum transmission distance is about 10–15 metres(33–49 ft.) and the maximum transmission speed is 19,200 baud.n Jumper must be fitted on pin 1-2 (lower position) of P-15 onCPU-board to select RS 232C.The following hardware straps can be fitted:P-3 DTR-signal:Pin 1–2 DTR indicates printer turned on.Pin 2–3 A copy of the flow signal RTS is produced.P-4 External 5 Volt1:Jumper fitted connects +5V to pin 16. Warning! Max 200 mA.P-5 CTS-signal:Pin 1–2: Normal CTS-signal.Pin 2–3: The STOPIN signal is grounded. Printer will act as ifit were permanently receiving a CTS signal, regardlessof what signal is actually received.The HPC always requires a CTS signal on "uart1:", regardless ofsetup. If no strap is fitted, the host must provide a CTS signal.INTERFACES, cont'd.Single Serial Interface Board:RS 232C (V24) on "uart1:"Continued!1/. Warning! Be careful not to enable theexternal 5V unintentionally, which maycause harm to the terminal, PC or otherdevice connected to this port! The 5V isnot protected against short-circuit.P-3P-4P-5123123"uart1:"
