Connect a device CRT 711 Card Issuing/Collecting Machine to a Rabbit LP3500

Rabbit
,
1

I have been working to connect a device CRT-711 Card Issuing/Collectting machine to serial port C. This device use the serial port to send and receive information to handle a paper card. Use data type named byte. It means that each byte that device send/receive is an instruction to the device.
Each byte has to be sent in a chain.
Could you help me with this problem?

Thanks in advance for your help

2

What have you tried so far? Do you know the baud rate of the device? Is it operating at TTL or RS232 serial levels? Can you connect the CRT711 to a PC serial port and see the bytes its sending? Can you connect it to the LP3500’s serial port and use one of the sample programs to get a dump of the bytes coming in?