Epson ColorWorks CW-C6500A Technical Reference Guide - External I/O CW-C6000/C - Page 15

Specification for I/O Signals

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Chapter 2 External I/O Specification Specification for I/O Signals This section describes the I/O signal specifications. Input/Output Item Value Input signal to the printer Type of output port on the Open drain or open collector output external device Low level VIL_max. 0.8 V Sink current Min. 2 mA Max. 7 mA *1 High level Sink current (leakage current) Max. 10 uA Output signal from printer Type of output port on the Open collector output (pull-up resistor is on the printer printer) Low level VOL_max. 0.8 V Allowable sink current Max. 1.8 mA *2 2 High level VOH_min. 4.0 V *3 ∗1 The sink current is limited by the current limiting resistance (R = 1 kΩ). ∗2 Do not use this as a drive for a high-current load such as a coil. ∗3 This depends on the pull-up resistance (Rpu = 10k ohm) of the printer and the input resistance of the external device. CAUTION Regardless of whether an external device is connected or the connected external device is turned on or off, when the printer is turned on, the power supply voltage and signal are output from the I/O power supply pin and output signal pin of the external I/O connector. Connect an external device under this assumption. Example input signal circuit +5 V Printer side External device side R Printer input External device output SG FG SG 15

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15
Chapter 2
External I/O Specification
2
Specification for I/O Signals
This section describes the I/O signal specifications.
∗
1
The sink current is limited by the current limiting resistance (R = 1 kΩ).
∗
2
Do not use this as a drive for a high-current load such as a coil.
∗
3
This depends on the pull-up resistance (Rpu = 10k ohm) of the printer and the input resistance of the external
device.
Example input signal circuit
Input/Output
Item
Value
Input signal to the printer
Type of output port on the
external device
Open drain or open collector output
Low level
VIL_max. 0.8 V
Sink current
Min. 2 mA
Max. 7 mA
*1
High level
Sink current (leakage current) Max. 10 uA
Output signal from printer
Type of output port on the
printer
Open collector output (pull-up resistor is on the
printer)
Low level
VOL_max. 0.8 V
Allowable sink current Max. 1.8 mA
*2
High level
VOH_min. 4.0 V
*3
CAUTION
Regardless of whether an external device is connected or the connected external device is
turned on or off, when the printer is turned on, the power supply voltage and signal are output
from the I/O power supply pin and output signal pin of the external I/O connector. Connect an
external device under this assumption.
+5 V
FG
SG
SG
R
Printer side
External device side
External device
output
Printer input