EXAMPLE -------
[source,c] -------------------
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; } -------------------

擦。。我申请创建的吧，我还不是管理员。。
使用RTU链接
modbus_t *modbus_new_rtu(const char *'device', int 'baud', char 'parity', int 'data_bit', int 'stop_bit');

Package Details: libmodbus 3.0.6-1Package Actions
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Git Clone URL: https://aur.archlinux.org/libmodbus.git (read-only)
Package Base: libmodbus
Description: A Modbus library for Linux, Mac OS X, FreeBSD, QNX and Win32
Upstream URL: http://libmodbus.org