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Or use a operational amplifier circuit at the receiving end.
For the Receiver side may be we can use Optocoupler but quite expansive for the design Embarrassed May i know is there any 12V logic device in this market? Do we have other option?
Thank for your advice... I though the MAX232 is +5V driver for RS232. I will try to use 12V for my data signal if i got time to modificed it.
"Resistor pull-up at transmitters is 33Ohm and the 10kOhm connected to ground at the receiver." That does not sound right. There is no need for a pull-up resistor at the transmitter. 10KOhm at receiver is way too high to act as terminating resistor.
http://www.analogzone.com/iot_0919.pdfIn the above app note look at Figure 9 and 10. Is that what you are trying to do?
In your case you have 5 slave devices instead of 3. If all the slave devices are very close together at the end of cable then use Series termination of figure 9, with Rs = 33ohms. Else use figure 10, with R = 50 to 100 Ohms.