Tally T5023+ Programming Manual page 382

Description of the physical interface
Pin 07 RTS – Request to Send
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)
Pin 01 Printer switched on
Exit
The 'ON' status informs the host system that the printer has been
switched on. The electrical features of this signal do not comply
with the standard. The signal position can depend on the receiver
physics of the host. This signal has been implemented to maintain
the compatibility with the predecessor, and it may no longer be
used with new applications.
ON status 5.6 kOhm at +12 V
OFF status 5.6 kOhm at SG
372
or ERROR
T5023/5023+ - Programming Guide
Appendix