I would make several assumptions.

1. Most character LCDs are used as modules with a 16 pin 0.1 inch spacing.

2. Most use HD44780 or clone and have an internal 270kHz clock.

3. Most have the module D0-7 and control signals in the same order.
The backlight pins quite often vary.

4. Some people use the 8 bit interface, others use 4 bits.

5. Some people do not use the RW pin, but just connect to GND.

6. If there is no Read capability, then you cannot read the Busy flag and therefore you have to allow waiting time for each command or data. The LCD will display just fine.

7. Nor can you read the memory contents with a RW pin at GND. However you can still write the user defined character.

8. If RW is connected to the 8051 then you can read both display memory and character memory.

9. If 1,2,3 are untrue then you must specify the EXACT model and data sheet. Any software must reflect the 4/8 bit interface and availability of a RW signal.

10. If you do not obey the correct timing for software initialisation then the module will not work.

David.