---
title: What is the compatibility mode and busy mode for BML-S1G with an absolute quadrature interface?
description: BML-S1G with absolute quadrature interface
---

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# What is the compatibility mode and busy mode for BML-S1G with an absolute quadrature interface?

## BML-S1G with absolute quadrature interface

**Compatibility Mode:**

In compatibility mode BML-S1G with Absolute Quadrature interface is fully compatible with standard incremental A/B/Z input cards.

- Following the power-on delay time a Z-signal is set to trigger the zero position at the receiver side (t2-t3);
- Afterwards A/B increments are sent at highest speed (min. edge separation) until the incremental position has reached the physical position (t3-t4);
- Subsequent A/B increments are sent according to the physical movement of the system (t4).

   
            ![](https://kb.innovatingautomation.asia/hubfs/image-png-Sep-25-2020-10-38-45-81-AM.png)

 

**Busy Mode:**

 The busy mode works with controllers and input electronics which is able to sent and evaluate external trigger signals. Busy mode is usually used together with activated VHrequest1) input.

- Following the power-on delay time a Busy signal is set high to trigger the zero position at the receiver side (t2);
- Afterwards A/B increments are sent at highest speed (min. edge separation) until the incremental position has reached the physical position (t3-t4);
- The Busy signal is set low (t4);
- Subsequent A/B increments are sent according to the physical movement of the system (t4).

      ![](https://kb.innovatingautomation.asia/hubfs/image-png-Sep-25-2020-10-39-39-89-AM.png)

             

 

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