This article was previously published under Q142324
You can use the Direct Cable Connection tool to establish a direct serial or parallel cable connection between two computers. Windows supports serial null-modem standard (RS-232) cables and the following parallel cables for use with Direct Cable Connection:
Standard or basic 4-bit cables
Enhanced Capabilities Port (ECP) cables
Universal Cable Module (UCM) cables
Parallel cable connections are faster than serial cable connections. Use aserial cable with Direct Cable Connection only if a parallel port or cableis unavailable.
ECP cables work on computers with ECP-enabled parallel ports. ECP must beenabled in both computers' CMOS settings for parallel ports that supportthis feature. ECP cables allow data to be transferred more quickly thanstandard cables. Note that both computers must support ECP in order to useECP cables.
UCM cables support connecting different types of parallel ports. Using aUCM cable between two ECP-enabled ports allows the fastest possible datatransfer between two computers.
Pin Connections for a Serial Cable
This section describes the wiring specifications for serial InterLinkcables that can be used with Direct Cable Connection. To make a serialInterLink cable, make a serial cable with either a 9-pin or 25-pin femaleconnector on both ends, and wire the cable as follows:
The Ground (GRD) line is the reference signal ground for all other lines.
The Transmit Data (TD) line is used for sending data.
The Receive Data (RD) line is used for receiving data.
The RTS (Request To Send) line is used by the data terminal equipment (DTE)to indicate that it is ready to send data.
The CTS (Clear To Send) line is used by the data communications equipment(DCE) to indicate that it is ready to receive data.
The DSR (Data Set Ready) line is used by the DCE to indicate that it is ready to communicate.
The DTR (Data Terminal Ready) line is used by the DTE to indicate that the DCE should initiate communication.
Pin Connections for a Parallel Cable
This section describes the wiring specifications for parallel InterLinkcables that can be used with Direct Cable Connection. To make a parallelInterLink cable, make a parallel cable with male DB-25 connectors at bothends, and wire the cable as follows: