modbus_rtu_get_rts3
Get the current rts mode in rtu
Usage
int modbus_rtu_get_rts(modbus_t *ctx);
Overview
The modbus_rtu_get_rts() function shall get the current Request To Send mode of the libmodbus context ctx. The possible returned values are:
• MODBUS_RTU_RTS_NONE
• MODBUS_RTU_RTS_UP
• MODBUS_RTU_RTS_DOWN
This function can only be used with a context using a RTU backend.
Return value
The function shall return the current RTS mode if successful. Otherwise it shall return -1 and set errno.
Errors
EINVAL
The libmodbus backend is not RTU.
Releases
3 releases since Debian 10 (Buster); the text changed 2 times.