...the initial start step go on until message "press 9 @ 9600 BAUD" and stop,could anyone know its meaning?thanks a lot.
I have an old Dataliner DL50 manual here. It has been a long time since I looked at it, but I will try to help you.
The DL50 was mainly a "slave" device, therefore it does not store any messages. The messages must be sent to it thru its RS232 or RS485 ports, as a series of ASCII characters. In many cases it was used with an Allen-Bradley BASIC module in the PLC or SLC (catalog #1771-DB for the PLC, and #1746-BAS for the SLC controllers). The BASIC module stored the messages in battery-backed RAM or EPROM memory. The modules were programmed (using the Basic language) to transmit the messages, along with status or variable data, when triggered by the logic in the programmable controller.
IF YOUR PLC OR SLC CONTROLLER HAS A BASIC MODULE WITH BATTERY, THE BATTERY COULD HAVE DIED.
Another way the DL50 was used with a DL20 or DL40 as the master, with the messages stored in the master device, then transmited to the DL50 slave.
To configure the DL50, there were 3 8-position DIP switches, S1, S2, and S3.
S1 sets the slave address.
S2-1 On = Duplex, Off = Simplex
S2-2, 3 sets character height
S2-4,5 sets Baud Rate:
4 5
OFF OFF = 300 baud
OFF ON = 1200
ON OFF = 9600 <-- I assume this is your setting.
ON ON = 19200
S2-6,7 sets operating mode (Slave or Test)
S2-8 is Duplex Checksum
S3-1,2 sets Display Type (catalog model number)
S3-3,4 sets Default Color
S3-5,6 Reserved (not used)
S3-8 is Bad Code Checksum.