Measurement Computing

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USB Digital I/O

Signal Conditioning Accessories

For digital signal conditioning, connect to Measurement Com-

puting relay mounting and interface boards:

CIO-ERB08 and CIO-SERB08

The CIO-ERB08 is a relay accessory board that includes 8 Form

C relays. The CIO-SERB08 provides similar functionality with

socketed relays. Both accessory boards have two 37-pin connec-

tors for interfacing with USB-DIO24 Series hardware.

• Connect to the USB-DIO24 Series with a C37FF-x cable.

CIO-ERB24 and CIO-SERB24/FD

The CIO-ERB24 is a relay accessory board that includes 24 Form

C relays. The CIO-SERB24/FD provides similar functionality with

socketed relays and fault detection. Both accessory boards have

a 37-pin D-type connector and a 50-pin header connector for

interfacing with USB-DIO24 Series and USB-DIO96H/50 devices.

• Connect to the USB-DIO24 Series with a C37FF-x cable.

• Connect to the USB-DIO96H/50 with C50FF-x cables.

CIO-ERB48 and CIO-SERB48

The CIO-ERB48 is a relay accessory board that includes 48 Form

C relays. The CIO-SERB48 provides similar functionality with

socketed relays Both accessory boards have a 50-pin header

connector for interfacing with the USB-DIO96H/50.

• Connect to the USB-DIO96H/50 with C50FF-x cables.

SSR-RACK08

The SSR-RACK08 is a relay accessory board that provides mount-

ing locations for eight Gordos or Opto 22 type solid-state I/O

modules. The board has two 37-pin D connectors for interfacing

with USB-DIO24 Series hardware.

• Connect to the USB-DIO24 Series with a C37FF-x cable.

SSR-RACK24

The SSR-RACK24 is a relay accessory board that provides

mounting locations for 24 Gordos or Opto 22 type solid-state

I/O modules. The board has one 37-pin D connector and two

50-pin header connectors for interfacing with USB-DIO24 Series

and USB-DIO96H/50 hardware.

• Connect to the USB-DIO24 Series with a C37FF-x cable.

• Connect to the USB-DIO96H/50 with C50FF-x cables.

SSR-RACK48

The SSR-RACK48 is a high-density relay accessory board that

provides mounting locations for 12 quad relays. The board

has one 50-pin header connector for interfacing with the

USB-DIO96H/50.

• Connect to the USB-DIO96H/50 with C50FF-x cables.

Specifications: USB-DIO24/37 and

USB-DIO24H/37

Digital Input/Output

Digital type

USB-DIO24: 82C55

USB-DIO24H/37

Input: 74ACT373

Output: 74FCT244

Number of I/O: 24 (Port A Bit 0 through Port C Bit7)

Configuration: 2 banks of 8 and 2 banks of 4, or 3 banks of 8

Pull-up/down configuration: all pins pulled up to 5V via 47 k

Ω resistors (default).

Selection available for pull down to ground. Hardware selectable via 0

Ω resistor.

Input high voltage: 2.0 V min, 5.5 V absolute max

Input low voltage: 0.8 V max, –0.5 V absolute min

Output high voltage

USB-DIO24/37 (IOH = –2.5 mA): 3.0 V min

USB-DIO24H/37 (IOH = –15 mA): 2.4 V min

Output low voltage

USB-DIO24/37 (IOH = –2.5 mA): 0.4 V max

USB-DIO24H/37 (IOH = 64 mA): 0.55 V max

Source current (USB-DIO24H/37)

Self-powered hub or externally powered root port hub: 15 mA per output,

max. Bus-powered or battery-powered root port hubs are not supported.

Sink current (USB-DIO24H/37):

365 mA/(number of outputs), max. 64 mA max sink current for any single

output. A low-side resettable fuse protects the USB-DIO24H/37. This is designed

to protect the host PC or hub from an over current condition. Assuming all

return currents in sinking applications return via the USB cable ground signal,

the maximum allowable return current is 500 mA. Include the USB-DIO24H/37

unloaded operating current (135 mA) in your power budget.

Power up / reset state: Input mode

Counter

Pin name: CTR; Schmitt trigger input.

Counter type: Event counter

Number of channels: 1

Input type: TTL, rising edge triggered

Input source: CTR screw terminal

Resolution: 32 bits

Schmidt trigger hysteresis: 20 mV to 100 mV

Input leakage current: ±1 µA

Maximum input frequency: 1 MHz

High pulse width: 500 ns min

Low pulse width: 500 ns min

Input low voltage: 0 V min, 1.0 V max

Input high voltage: 4.0 V min, 15.0 V max

Data Transfer Rates

Digital I/O transfer rates (software paced)

Digital input: 62 port reads or single bit reads per second (typ)

Digital output: 125 port writes or single bit writes per second (typ)

Counter/timer read/write rates (software paced)

Counter read: 62 port reads per second (typ)

Counter clear: 125 port writes per second (typ)

Power

Supply current:

USB-DIO24/37: 20 mA typ, 40 mA max. (Total current requirement; includes

up to 5 mA for the status LED.)

USB-DIO24H/37: 100 mA typ, 135 mA max. (Total current; no load)

USB +5V power available

Connected to self-powered hub

USB-DIO24/37: 4.5 V min, 5.25 V max

USB-DIO24H/37: (350 mA) – (total output source current)

Connected to bus-powered hub

USB-DIO24/37: 4.1 V min, 5.25 V max

USB-DIO24H/37: 4.75 V min, 5.25 V max

Self-powered refers to USB hubs/hosts with a power supply. Bus-powered refers to

USB hubs/hosts without a power supply. Bus-powered hubs provide downstream

USB power as low as 4.4 V. Guaranteed performance requires a minimum supply

voltage of 4.75 V. Self-powered and root port hubs meet this minimum.

Specifications