RDG-24 Remote 24-Channel Digital I/O Pod
24 programmable digital I/O lines with isolated RS-485, counters, and pulse outputs
Features
- 24 remote digital I/O lines, programmable by bit, byte, or 24-bit word
- Opto-isolated RS-485 serial interface
- Inputs and open-collector outputs compatible with voltages up to 50 VDC
- 350 mA maximum sink current per output, with a 650 mA maximum per six-bit group
- 16-bit input event counters and per-input change-of-state detection
- Programmable input sampling from 14 Hz to 1 kHz and output pulses from 7 Hz to 500 Hz
- Protective steel enclosure and on-board watchdog
- Designed and manufactured in the USA
$225.00
In StockDescription
RDG-24 is an intelligent remote digital I/O unit with 24 programmable lines and an opto-isolated RS-485 interface. A protective steel enclosure supports installation near field signals, while software controls the direction and state of individual bits, 8-bit bytes, or the complete 24-bit word.
Inputs accept signals up to 50 VDC. Each input supports a 16-bit software event counter with selectable rising- or falling-edge counting, plus an individually enabled change-of-state flag that can be read through the serial port. The input sampling rate is programmable from 14 Hz to 1 kHz.
Open-collector outputs support latched levels, timed pulses, or free-running square waves from 7 Hz to 500 Hz. Each output can sink up to 350 mA, subject to a combined 650 mA maximum for each group of six outputs. Outputs support external voltages up to 50 VDC and include inductive suppression diodes.
An on-board 8031 microcontroller, 8K of RAM, and 8K of EEPROM support local processing and data retention for later retrieval by the host. A watchdog resets the unit if the processor stops responding or the supply voltage falls below 4.75 VDC. An optional 32K EEPROM configuration is available.
Standard half-duplex operation requires no switch settings. Jumpers select two-wire or four-wire communication and can bypass the serial-interface opto-isolators when the application requires it. Packaged wireless, USB, RS-232, and Ethernet connectivity versions are also offered.
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
Digital Inputs
| Channels | Up to 24, configurable individually, by 8-bit byte, or as a 24-bit word |
|---|---|
| Input sample rate | Software programmable from 14 Hz to 1 kHz |
| Event counters | 16-bit software counter per input; rising- or falling-edge counting up to 65,535 transitions; read and reset commands |
| Change-of-state detection | Individually enabled input flags, readable through the serial port |
| Logic low | −0.5 to +0.8 VDC |
| Logic high | +2.0 to +50.0 VDC |
| Low-level input current | 450 µA maximum |
Digital Outputs
| Channels | Up to 24, configurable individually, by 8-bit byte, or as a 24-bit word |
|---|---|
| Output modes | Latched level, pulse, or free-running square wave |
| Pulse rate | Software programmable from 7 Hz to 500 Hz |
| Output type | Open collector with an inductive suppression diode in each circuit |
| Maximum sink current | 350 mA per output; 650 mA combined maximum per six-bit group |
| Current-limit groups | Bits 0–5, 6–11, 12–17, and 18–23 |
| Voltage compliance | Up to 50 VDC with a user-supplied voltage |
| Internal pull-up | 10 kΩ to +5 VDC when no external voltage is supplied |
Processing and Interface
| Host interface | Opto-isolated RS-485; jumper-selectable two-wire or four-wire operation |
|---|---|
| Processor | 8031 microcontroller |
| Memory | 8K × 8 RAM and 8K × 8 EEPROM; 32K × 8 EEPROM option |
| Watchdog | Processor watchdog and reset below a 4.75 VDC supply level |
| Enclosure | Protective steel enclosure, 8.5 × 5.25 × 2 inches; CE-marked configurations use a NEMA 4 enclosure |
Power and Environmental
| Serial-interface power | 7.5 to 25 VDC at 40 mA for the opto-isolated section |
|---|---|
| Local power | 7.5 to 16 VDC at 150 mA |
| Operating temperature | 0 to 65 °C; optional −40 to +80 °C configuration |
| Temperature derating | Maximum operating temperature depends on the applied power-supply voltage |
| Storage temperature | −50 to +120 °C |
| Humidity | 5% to 95% RH, non-condensing |
Select the standard RS-485 model or a packaged host-connectivity version. The USB, RS-232, Ethernet, and wireless versions use connectivity hardware with the remote pod. Contact ACCES for configuration, pricing, and availability of packaged versions.
Call for Pricing
- WM-RDG-24 — 24-channel remote digital I/O pod, Wireless host-connection package
- U-RDG-24 — 24-channel remote digital I/O pod, USB host-connection package
- S-RDG-24 — 24-channel remote digital I/O pod, RS-232 host-connection package
- E-RDG-24 — 24-channel remote digital I/O pod, Ethernet host-connection package
| Model | Description | Price (USD) | |
|---|---|---|---|
| RDG-24 | 24-channel remote digital I/O pod, RS-485 | $225.00 | |
| WM-RDG-24 | 24-channel remote digital I/O pod, Wireless host-connection package | Call for price | |
| U-RDG-24 | 24-channel remote digital I/O pod, USB host-connection package | Call for price | |
| S-RDG-24 | 24-channel remote digital I/O pod, RS-232 host-connection package | Call for price | |
| E-RDG-24 | 24-channel remote digital I/O pod, Ethernet host-connection package | Call for price |