---
name: "modbus_close"
section: "3"
platform: "linux"
package: "libmodbus-dev"
version: "3.1.6-2.1"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/modbus_close"
---

# modbus\_close(3)

close a Modbus connection

## NAME

modbus\_close - close a Modbus connection

## SYNOPSIS

**void modbus\_close(modbus\_t \****ctx***);**

## DESCRIPTION

The **modbus\_close()** function shall close the connection established with the backend set in the context.

## RETURN VALUE

There is no return value.

## EXAMPLE

```
modbus_t *ctx;
ctx = modbus_new_tcp("127.0.0.1", 502);
if (modbus_connect(ctx) == -1) {
    fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
    modbus_free(ctx);
    return -1;
}
modbus_close(ctx);
modbus_free(ctx);
```

## SEE ALSO

[**modbus\_connect**(3)](/modbus_connect/3.md)

## AUTHORS

The libmodbus documentation was written by Stéphane Raimbault \<stephane.raimbault@gmail.com\>