Modbus protocol creating trouble for 16f628A chip

[buneri]

I have used the 16f877A chip for modbus protocol by using ccs driver modbus.c, it works fine!
Bur when i used 16f628A chip for that purpose the serial port is creating problem. What should i change in the driver to be applicable for 16f628A chip.
Any help will be appreciable.

[PCM programmer]

Post the pins that you are using in these #define statements.

[buneri]

Thx for reply!

Compiler Version PCWH 4.020
I m trying for RS232

#define USE_WITH_PC 1

#include <16f628A.h>
#device *=16
#fuses HS,NOLVP, NOBROWNOUT, NOPROTECT, PUT
#use delay(clock=20M)

#define MODBUS_TYPE MODBUS_TYPE_SLAVE
#define MODBUS_SERIAL_RX_BUFFER_SIZE 64
#define MODBUS_SERIAL_BAUD 9600

#ifndef USE_WITH_PC
#define MODBUS_SERIAL_INT_SOURCE MODBUS_INT_RDA
#define MODBUS_SERIAL_TX_PIN PIN_B0 // Data transmit pin
#define MODBUS_SERIAL_RX_PIN PIN_B1 // Data receive pin

//The following should be defined for RS485 communication
#define MODBUS_SERIAL_ENABLE_PIN PIN_C1 // Controls DE pin for RS485
#define MODBUS_SERIAL_RX_ENABLE PIN_C2 // Controls RE pin for RS485

#else
#define MODBUS_SERIAL_INT_SOURCE MODBUS_INT_RDA
#endif

[adrian]