05-12-2010
This website has lots of good RS232 information. You do not need the rts/cts connections.
RS232 serial cable pinout information
Start by configuring kermit for 9600 baud, 8 bits, no parity, 1stop bit. Presumably you will be using COM1. If your DOS computer has two serial ports, you will have to determine which is COM1 and which is COM2.
Read the man pages for inittab, agetty, and if you have trouble sleeping termios.
You can use the 9 pin ports.
Last edited by jgt; 05-12-2010 at 11:12 AM..
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LEARN ABOUT DEBIAN
modbus_rtu_set_serial_mode
MODBUS_RTU_SET_SERIA(3) Libmodbus Manual MODBUS_RTU_SET_SERIA(3)
NAME
modbus_rtu_set_serial_mode - set the serial mode
SYNOPSIS
int modbus_rtu_set_serial_mode(modbus_t *ctx);
DESCRIPTION
The modbus_rtu_set_serial_mode() function shall set the selected serial mode:
MODBUS_RTU_RS232
the serial line is set for RS232 communication. RS-232 (Recommended Standard 232) is the traditional name for a series of standards for
serial binary single-ended data and control signals connecting between a DTE (Data Terminal Equipment) and a DCE (Data
Circuit-terminating Equipment). It is commonly used in computer serial ports
MODBUS_RTU_RS485
the serial line is set for RS485 communication. EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the electrical
characteristics of drivers and receivers for use in balanced digital multipoint systems. This standard is widely used for
communications in industrial automation because it can be used effectively over long distances and in electrically noisy environments.
This function is only supported on Linux kernels 2.6.28 onwards.
RETURN VALUE
The modbus_set_serial_mode() function shall return 0 if successful. Otherwise it shall return -1 and set errno to one of the values defined
below.
ERRORS
EINVAL
The current libmodbus backend is not RTU.
ENOTSUP
The function is not supported on your platform.
If the call to ioctl() fails, the error code of ioctl will be returned.
AUTHORS
The libmodbus documentation was written by Stephane Raimbault <stephane.raimbault@gmail.com[1]>
NOTES
1. stephane.raimbault@gmail.com
mailto:stephane.raimbault@gmail.com
libmodbus 3.0.3 05/26/2012 MODBUS_RTU_SET_SERIA(3)