AMT Datasouth FASTMARK 4600 - Manual (Page 71)

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The simplest way to connect to other hosts (not PC compatible) or terminals is:
Printer Terminal/Host
Pin 2- RxData
………
TxData
Pin 3- TxData
………
RxData
Pin 5- Ground ……… Ground
In general, as long as the data quantity is not too large and you use Xon/Xoff as
flow control, it will be problem free.
Baud rate:
1200, 2400, 4800, 9600(default), 19200, 38400, 57600,115200
bauds. (Programmable by command)
Data format: always 8 data bits, 1 start bit and 1 stop bit.
Parity:
always non parity
Handshaking:
XON/XOFF as well as CTS/RTS (hardware flow control).
If you run an application with the bundled printer driver under
Windows and use the serial port, you should check the above parameters and
set the flow control to "Xon/Xoff "or "hardware".