Chapter 2 External I/O Specification Example input signal circuit I/O power (VCC_EX) +5 V External device side External device output FG SG SG Example output signal circuit External device side 2 External device input Printer output Specification for I/O Signals (I/O Power (VCC_EX)/SG Separated) 18 _ Printer side R Printer input I/O power (VCC EX) + 5 V _ Printer side Input/Output Item Value Input signal to the printer Input port on the printer Support for an open drain or open collector output I/O power (VCC EX) _ Voltage range 5–28 V Low level VIL max. 0.8 V _ VIL max. 1.5 V (When VCC EX = 12–28 V) _ _ Sink current Min. 0.6 mA Max. 6.6 mA*1 High level (Allowable leakage current) Max.
100 uA Output signal from printer Output port on the printer Open drain output (pull-up resistor is on the printer) I/O power (VCC EX) _ Voltage range 5–28 V Low level VOL max. 0.8 V _ Sink current Max. 50 mA *2 High level VOH min. VCC EX *0.8 V *3 _ _ Leakage currentMax. 50 uA