[ts-7000] RS-485 on TS-7800 shows no signs of life

["dieghuot" <>]

I cannot communicate with the RS-485 port.  So far I have done the 
following:

1. Connected TS7800(port2, pins1-6)-->RS485toUSBconverter
2. Opened /dev/ttyS1 (for COM2);
3. Cleared 0xE800000C top bit (bit 15) to zero to set RS485 mode;
4. Disabled both getty lines in /etc/inittab;
5. Modified and tested multiple port configurations (using termios 
functions).

I have no problems using RS-232 and see no software errors when 
configuring any port.  At this point I am wondering if my board has 
the rs485 option (I did purchase it).

Does anybody know of any way to check if the option is installed? I 
tried looking at the chips but cannot access them all.

Any comments/suggestions would be greatly appreciated. 
 
  


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