The short answer: yes.Modern network interface cards almost all support Auto-MDIX, so a standard straight-through cable plugged into both ends will negotiate automatically — no need to hunt for an old crossover cable. Take the USR-TCP232-410s as an example: its Ethernet port is 10/100 Mbps with auto MDI/MDX, and it detects the wiring automatically whether connected directly or through a switch.
① Someone once built an open-source tool specifically for transferring large files between two computers — machine-to-machine data exchange is a common need.
② The same need shows up on the factory floor: two industrial PCs need to exchange data, there is no network cabling in place, and Wi-Fi is not dependable — metal equipment blocks signals, electromagnetic interference causes packet loss, and coverage is unstable. Fixed equipment running 24/7 is most vulnerable to link drops. In this situation, running one Ethernet cable between the two is the lowest-cost option and gives the most deterministic link.
With no router between the two ends, there is no DHCP server, so static IPs must be configured manually. It is simple: put both ends in the same subnet with different host numbers. For example:
On Windows, change this in the IPv4 settings of the network adapter; on Linux, use nmcli or ip addr. Ping the peer address first, and only start transferring data once it replies. Some devices offer their own IP assignment options — the 410s, for instance, supports both Static and DHCP, so in a direct-connection scenario simply select Static and enter the values manually.
Yes. TCP/IP is a common protocol stack both sides follow. As long as they are in the same subnet with matching masks, Windows and Linux can ping each other and transfer files normally; the OS difference does not affect the Layer-2 direct link.
With two devices, a direct connection is the simplest option — one less intermediate hop and a more deterministic path. With more devices that need to be networked together, add a switch so that the host PC, servers, and cloud platforms can all join in.
The trade-off of a direct connection is limited expandability — when more devices are added later or remote monitoring is required, a switch will be needed anyway. A switch, on the other hand, is itself an additional point of failure: every extra node in an industrial site is one more thing to troubleshoot. For fixed, long-running point-to-point setups, a direct connection is the more worry-free choice.
The negotiated link speed of a direct connection depends on the NICs at both ends. If both are gigabit NICs with Cat5e or better cabling, they can negotiate 1000BASE-T; if either end has a 100 Mbps port, the link settles at 100M. Actual throughput is also limited by disk read/write speed — watch Task Manager or iostat when transferring large files.
If serial devices sit on the link, the bottleneck is on the serial side. The Ethernet port on a serial port to ethernet adapter is typically 10/100 Mbps, which far exceeds serial rates — the 410s supports serial baud rates up to 230.4 Kbps, so its 100 Mbps Ethernet port is more than enough. The overall link speed is determined by the serial device itself.
A wired direct connection naturally avoids the typical problems of Wi-Fi: electromagnetic interference, metal obstruction, and unstable coverage. The cable itself also has shielding and isolation protection — the 410s Ethernet port provides 1.5 KV electromagnetic isolation, an operating temperature range of -40℃ to +85℃, a metal housing for heat dissipation, hardware and software dual watchdog to prevent lockups, and DC 5-36 V wide-voltage power input. For fixed equipment running continuously, these matter more than raw speed.
If a machine on site only has RS232/RS485 serial ports and no Ethernet port, connect it to a serial device server first, then use the Ethernet cable for a direct link or a networked setup. The 410s is the classic dual-port model: one RS232 and one RS485 channel that work simultaneously, suited to connecting two types of serial peripherals to one device. It performs Modbus RTU/TCP conversion in both directions, can act as a master polling up to 16 hosts, or act as a slave responding to network requests. Configuration is done through the built-in web page, configuration software, or AT commands, keeping the learning curve low. It is certified to CE, FCC, RoHS, and WEEE. If only a single serial type is present, single-port models in the same family (RS232-only or RS485-only) are available.
Steps to get started:
① confirm the device interface type (RS232/RS485/Ethernet);
② configure static IPs for a direct connection, or connect through a switch for a networked setup;
③ ping the peer, then start transferring data according to the application protocol.
