Epson TM-L500A RFID Technical Reference Manual page 65

DSUB9 DSUB25 Signal
Pin no. Pin no. name
7 4 RTS
8 5 CTS
9 — SG
Signal
direction
Output <When RTS/CTS flow control is selected>
Indicates whether or not the printer is BUSY.
SPACE indicates that the printer is ready to receive data,
and MARK indicates that the printer is BUSY.
The printer goes BUSY when the printer is made offline by
pressing down the On/Off Line button or when the receive
buffer is full.
<When DTR/DSR flow control is selected>
Indicates whether or not the printer power is ON.
SPACE indicates that the printer power is ON, and MARK
indicates that the printer power is OFF.
Input <When RTS/CTS flow control is selected>
Indicates whether or not the host computer is ready to
receive data.
SPACE indicates that the host computer is ready to receive
data, and MARK indicates that the host computer is not
ready to receive data.
When RTS/CTS control is selected, check the status of this
signal before transmitting data.
<When DTR/DSR flow control is selected>
This signal is not used.
— Signal ground
Function
Appendix
65