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Man Pages
MODBUS_RTU_GET_RTS(3) libmodbus Manual MODBUS_RTU_GET_RTS(3)

modbus_rtu_get_rts - get the current RTS mode in RTU

int modbus_rtu_get_rts(modbus_t *ctx);

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.

The function shall return the current RTS mode if successful. Otherwise it shall return -1 and set errno.

EINVAL
The libmodbus backend is not RTU.

modbus_rtu_set_rts(3)

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>
12/20/2018 libmodbus v3.1.4

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