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4-3. Connectors and Signal Names
SERIAL
51
6
9
1. From when the power
is turned on or I/F reset
until communication
possible
2. Test printing
3. Cover open
4. Paper feed by paper feed
switch
5. Stop due to no paper
6. During waiting for
switch input in macro
execution
7. Other errors
8. Receiving buffer full
BUSY BUSY
BUSY BUSY
– – – BUSY
– – – BUSY
– – – BUSY
– – – BUSY
– – – BUSY
BUSY BUSY
Memory SW #4-4
10
Printer Status
4-3-1. RS-232C Interface
Pin No.
Signal name
Direction
Function
1 FG – Frame ground
2 RXD IN Receiving data
3 TXD OUT Transmission data
4 DTR OUT ESC/POS mode
1) DTR/DSR communication mode
Indicates if printer is busy or not.
Space: Printer ready
Mark: Printer busy
The conditions for busy will vary according to
the memory switch settings.
2) XON/XOFF Communication mode
Indicates when printer can receive data from
host. This is space, except for the following.
1. After reset until communication possible.
2. During test printing.