DR240/DR240A Inputs

The DR240A is an update to the DR240, adding 4 analogue inputs, and analogue output and an auxiliary 5V power output to the board in the same footprint. To add all these extra outputs, some compromises have had to be made. Specifically, the "common" signals for the optically-isolated inputs have been grouped together.

When replacing a DR240 with a DR240A, this can cause some confusion.

Here's the DR240 input area:

Here's the DR240A input area:

The "C03" terminal is the common signal for inputs 0 to 3, and the "C47" input is the common signal for inputs 4 to 7.
"Ao0" is the analogue output. It has a range of 0-10V and can supply up to 30mA.
"Ai0" to "Ai3" are the analogue inputs. You can use the matching "VIT" links to select the mode:

If the link is across the "V" pins, the matching input reads voltages in the range 0-10V.
If the link is across the "I" pins, the matching input reads currents in the range 0-20mA.
If the link is across the "T" pins, the matching input reads thermistors.

The extra "+5" pin next to the Modbus inputs is rated to supply up to 50mA.

Features

The DR240 has the following features:

Fully programmable SPLat controller with all the latest, relevant SPLat features.
Network it with 2 wires to other DIN Family members for expanded I/O
8 --> 24 VDC operation, ~70mA maximum at 24 VDC
8 x optically isolated inputs, 24VAC/DC max
8 x mains switching relays
USB programming port (mini B)
N/O contacts rated at 240VAC @ 5A / 125V @ 10A / 30VDC @ 5A
4 way DIP Switch
N/C contacts rated at 3A for all voltages
1 programmable bi-colour LED (red/green)
RS485 interface. Use for MODBUS, Xwire or your own protocol
TTL Xwire interface
TTL serial interface
Connects to any SPLat controller with latest Xwire drivers
Dimensions: 102mm x 118mm (4.0" x 4.65") in DIN holder
Has mounting holes for DIN-less mounting

The DR240A adds the following features:

Auxiliary 5 Volt DC output at 50mA
1 x 0-10 Volt analogue output, same capabilities as the DA8
4 x analogue inputs (voltage or current or temperature), same capabilities as the DA8

Firmware

It is important to note that DR240A firmware and DR240 firmware are NOT compatible with each other. However, DR240 SPlatware will work correctly on a DR240A.

DR240

The firmware download page has the tools and instructions you need for updating your DR240's firmware. The latest firmware is also available here:

Download DR240 V4.4

The firmware revision history is available here .

DR240A