Tally T5023+ Programming Manual page 381

Appendix
Signal description and connector assignment
Pin 05 SG – Signal Ground
Data lines
Pin 03 TD Transmitted Data
Serial data output printer --> Host
Pin 02 RD Received Data
Serial data input printer <-- Host
Control lines
Pin 08 CTS – Clear To Send
Entry
In the DTR/Busy and XON/ XOFF protocol the 'ON' status signals
to the connected device (signal receiver=printer) that it is ready to
receive data. Not used in the XON/ XOFF 2 protocol.
Pin 04 DTR – Data Terminal Ready
Exit
In the DTR/Busy protocol the 'ON' status signals to the connected
device (signal receiver=host) readiness to receive data.
In the XON/ XOFF protocol DTR and RTS reflects back the
operating readiness of the printer:
– DTR/RTS active: Online
– DTR/RTS inactive: STOP (STOP key and operating interruption)
Description of the physical interface
or ERROR
T5023/5023+ - Programming Guide
RS- 232 interface
371