Choosing break-out modules and I/O modules
Do you need to bring an existing connector out to terminals, or does an application need to read digital signals and switch outputs? This distinction is the first step towards the right component. This guide supports product selection; always use the individual module's specifications and manual for connection and operation.
Connecting D-Sub or ribbon cables to screw terminals
A passive break-out module connects a plug or socket to screw terminals. It does not convert a protocol or read signals by itself. For D-Sub cables, select a module by pin count, shell size and contact arrangement. For ribbon cables, also check pitch, orientation and the position of pin 1.
Our D-Sub modules are available with 9, 15, 25, 37 and 50 pins, with male and female connectors wired in parallel. Header modules use dual-row connectors with a 2.54 mm pitch. For both families, check wire cross-section, current and voltage limits, and pin assignments. Matching pin counts alone do not guarantee compatibility.
For a control cabinet, also check the mounting rail, module dimensions and cable exit. Allow sufficient space for connectors, cable bending radii and access to terminals. Each product page provides technical specifications and data sheets to help with these checks.
Choosing relay or semiconductor outputs
The right output type for an I/O module depends on the connected load. Relays switch through mechanical contacts, so contact ratings and service life matter. Semiconductor outputs have no mechanical contacts, but must be used within their specified voltage, current and polarity conditions.
The L variants of our USB and RS232 modules use high-side semiconductor outputs with a shared output supply. The R variants have relay contacts. Check the specifications for isolation between channels and the supply: galvanic isolation does not imply the same channel arrangement in every version.
Compare load voltage, continuous current, inrush current and switching frequency with the ratings of the individual module. For inductive loads in particular, follow the protective measures described in the manual. If the load requirements are unclear, ask for technical advice before ordering.
Connecting digital 24 V signals through USB or RS232
XUP and XSP modules each provide 8 digital inputs and 8 digital outputs. The inputs are designed for 24 V DC. They support simple tasks where a PC application reads signal states or sets outputs. The modules are not a substitute for a safety controller.
Choose the interface to suit the existing controller: USB uses a virtual COM port with suitable drivers. With an existing RS232 port, the application can communicate serially. Do not confuse RS232 with RS485 or a TTL UART interface.
The online documentation describes ASCII commands for your own applications. MFR Config for Windows, macOS and Linux supports configuration; check suitable drivers and their operating system support separately. Before connecting signals, check supply requirements, reference potentials and permitted signal levels in the manual.