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Appendix

Mercury II 6000 Series Encoders

Installation Manual and Reference Guide

7.5 Serial Interface Specifications

Introduction

The serial interface to the Mercury II 6800Si/Pa allows a serial host (controller) to receive position

and status information serially from the sensor. Serial communications between the encoder and

controller permit high speed motion system operation with high encoder resolution: up to 10m/s

with the 1.2nm. The serial data word consists of the following sequence:

 Position word of four start bits

 Four to thirty-five position bits

 Nine bits of status

 Six-bit Cyclic Redundancy Check (CRC) to provide error detection

 Four stop bits

The encoder’s position is sampled by the MII6800Si at the moment the host commands a sample

(falling edge of nCS); the only latency in the system is the time required for the host to receive the

position word. This architecture minimizes latency and eliminates jitter due to sampling

uncertainty.

Serial Interface Input/Output

MII6800Si (Serial Interface)

Name

Direction

Description

SDATA_OUT+

OUTPUT

Serial Data from Sensor to Host

SDATA_OUT-

OUTPUT

Serial Data from Sensor to Host

SCLOCK_OUT+

OUTPUT

Serial Clock from Sensor to Host

SCLOCK_OUT-

OUTPUT

Serial Clock from Sensor to Host

SCLOCK_IN+

INPUT

Serial Clock from Host to Sensor

SCLOCK_IN-

INPUT

Serial Clock from Host to Sensor

nCS+

INPUT

Chip Select from Host to Sensor

nCS-

INPUT

Chip Select from Host to Sensor (Negative True to start capture)

7,8

+5V

2,9

GND

Alarm

OUTPUT

For low level or saturated signal

Reserved

Do Not Connect

Reserved

Do Not Connect

MII6800Pa (Panasonic)

The following are the pins used by the MII6800Pa Panasonic serial interface.

 Pins 2, 7, 8, 9 are the same for both MII6800Si and Panasonic

 Pins 10 and 11 are different for Panasonic

 All other pins for Pa are not connected (NC)

Name

Direction

Description

REQ_SD+

Input/Output

Request for Serial Data from Host to Sensor

REQ_SD-

Input/Output

Request for Serial Data from Host to Sensor

7,8

+5V

Input

2,9

GND

Input

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 72 73

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