Section 3: Interface Specifications
Page 3-4
CG4 Series Service Manual
3.2 RS232C HIGH SPEED SERIAL INTERFACE (cont’d)
3.2.2 Ready/Busy
This protocol controls the reception of print data only by the control of hardware signal. Use the command
<I2> to toggle between single item buffer and multi item buffer.
When the print data (STX ESC+”A”~ ESC+”Z” ETX) is sent from the host in the conditions below, received
data may be incorrect.
1) When the printer is Offline
2) When an error has occurred in the printer
Pin Assignments
Interface Signals
Notes:
Follow the procedures below when executing READY/BUSY control.
1) When the host sends the data for printing labels, make sure that the printer is on.
2) Turning the printer on after the printer receives a request from the host to print labels may cause the
printer not to print the first print data (approximately 120 bytes).
To avoid this problem, it is necessary to attach approximate 120 bytes of dummy data by application
software that enables the host to send the data for printing labels.
For example: When sending [STX+<A>+<V>20+<H>20+<P>2+<L>0202+<X20>,
1234+<Q>2+<Z>+ETX], transfer the appropriate 120 bytes of dummy data shown below.
[00H+00H+ ~ +00H+00H+00H+00H] + [STX ~ ETX]
Pin no. Signal Type Direction Description
2 RD Input Data transferred from the host to the printer
3 SD Output Data transferred from the printer to the host
4 ER Output Data terminal READY
5 SG - Signal ground
6 DR Input Data set READY
7 RS Output Send request
8 CS Input READY to send
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