QSC QIO‑S4 – 4‑Port Serial Network I/O Expander

Name: QSC QIO‑S4 – 4‑Port Serial Network I/O Expander
SKU: 5024
Availability: InStock

•Four (4) bi-directional RS232 serial ports
•One port includes RS422 and RS485 compatibility
•Daisy-chain up to four QIO expanders on a single network
•Power over Ethernet (PoE) capable

The QSC QIO-S4 is a 4-channel serial I/O expander designed for seamless integration into the Q-SYS Ecosystem, enabling network-based control of serial-enabled third-party devices such as projectors, video switchers, displays, matrix routers, and legacy control systems. Supporting RS-232, RS-422, and RS-485 protocols, the QIO-S4 gives system integrators the flexibility to connect and automate a wide range of AV hardware over a standard IP network.

With native Q-SYS integration via Q-SYS Designer Software, the QIO-S4 eliminates the need for traditional serial control wiring to and from the Q-SYS Core, enabling decentralized, room-based deployment strategies. Its PoE-powered, DIN-rail mountable form factor allows for clean, compact installations in AV racks or behind equipment.

This expander is ideal for conference rooms, educational facilities, houses of worship, and large-scale AV installations requiring dependable serial communication and control through the Q-SYS platform.

Specifications

Specifications	QIO-S4
Serial Ports
RS-232 / RS-485 / RS-422	One (1) port, configurable protocol, baud rate, and flow control
RS-232	Three (3) ports, configurable protocol, baud rate, and flow control
Other Connectors
External Power Supply	24 VDC nominal, 2.5 A on Euro connector with daisy-chain option (QIO-PSU sold separately)
LAN (PoE)	Gigabit LAN connection for Q-LAN, PoE
PoE Specification	IEEE 802.3af Type 1
LAN (Thru)	Ethernet daisy-chaining
General
Dimensions	5.5 x 4.25 x 1.59 in (139.7 x 108 x 40.4 mm)
Weight	1.18 lb (0.54 kg)
Mounting Options	Surface- and wall-mountable (hardware included); Rack-mountable 1RU, quarter-rack width (QIO-RMK rack kit sold separately)
Environmental
Operating Temperature	0°C to +50°C
Humidity	0%–85% through 30°C non-condensing
Storage Temperature	-20°C to +70°C
Compliance	FCC 47 CFR Part 15, IC ICES-003, CE (EN55032, EN55035), EU RoHS (2011/65/EU), WEEE (2012/19/EU), China RoHS (GB/T26572), EAC, UL, C-UL, NOM-019

Features and Benefits

Native network Serial connectivity solution for Q-SYS
Four (4) bi-directional RS232 serial ports
One port includes RS422 and RS485 compatibility
Power over Ethernet (PoE) capable
Daisy-chain up to four QIO expanders on a single network run (with local daisy-chained DC power)
Simple drag-and-drop integration and comprehensive management via Q-SYS Designer Software and Q-SYS Reflect
Surface- or rack-mountable (1RU, quarter width)
Includes surface mounting hardware

Network Serial connectivity where you need it
The QIO-S4 allows you to provide your Q-SYS system with greater flexibility to deploy Serial control connectivity where it’s most convenient. The QIO-S4 features four (4) bi-directional RS232 serial ports (including one port with RS422 and RS485 compatibility, enabling Q-SYS control over lighting systems, video displays, conference systems and more. Additionally, each of the QIO Series I/O expanders features a compact form factor that can be rack- or surface-mounted.
Expanded I/O customization
QIO Series is intended to present a simpler way to add network I/O connectivity to Q-SYS systems, decoupling the physical location of the I/O from processing hardware to support distributed or centralized processing architectures. Additionally, QIO Series lets you customize your I/O configuration, and compliments the strengths of newer Q-SYS Core models that were designed with fewer onboard I/O options (Core Nano, Core 8 Flex, or NV-32-H (Core Capable)).

Graphic showcasing daisy-chained QIO Series devices over an office space

Simplicity & scalability
Daisy-chain up to four of the QIO Series devices on a single network run (with local daisy-chained DC power) to consume fewer network ports, avoid rack clutter, and allow for quicker future expansion without pulling additional network cables. Alternatively, QIO Series are also PoE-capable, providing simple single cable connectivity (when devices aren’t daisy-chained).
Designed for Q-SYS
The QIO Series deliver native network I/O customization to Q-SYS, a cloud-manageable audio, video and control platform, built to deliver scalable, flexible AV solutions into the future. Learn more about Q-SYS.