Digital Gauge Frequently Asked Questions

The circuit configuration for the DG-4240 and DG-4280 regarding BCD OUT is similar.

This shows the recommended interface for connecting BCD OUT to external devices such as sequencers.
For the pin configuration of the BCD connector, please refer to DG-4240 BCD OUT specifications and DG-4280 BCD OUT specifications.

 

Recommended Interface

BCD output, polarity output, decimal point output, error output, print command output

 

output format	Open collector output
output IC	74LS07
withstand voltage	max 30V It is recommended to use it with a power supply system below 24V for improved reliability.
maximum sink current	max 32mA
residual voltage	max 0.5V

 

<2> Hold input, reset input, BUSY input

The interface recommends the following circuit.

 

 

 

Input low level voltage	0～1.4V
Input Hi Level Voltage	3～5.25V
input impedance	more than 1kΩ

 

When connecting to a sequencer.

<1> BCD OUT

 

The BCD output signal is an open collector output, so please connect it to an open collector input unit (with a voltage range of DC 12 to 24V) on the sequencer side. Please note that connecting the external power supply with reversed polarity will damage the BCD output circuit.

 

 

 

<2> Hold input, reset input signal

 

The BCD connector input specifications for DG-4240/DG-4280 are designed for voltage signal input, so it is recommended to connect the sequencer side to a voltage output unit (such as TTL).
When driving with an open collector or relay contact, there may be malfunctions due to noise and other environmental conditions at the site.
For input via contacts, it is recommended to use terminal block inputs.