User's Manual

ACR1281S

 Advanced Card Systems Ltd. Page 14 of 56

SERIAL COMMUNICATION PROTOCOL (CCID-LIKED FRAME FORMAT)

Communication setting: 9600 bps(Default), 19200 bps, 38400 bps, 57600 bps and 115200

bps,128000bps, 250000bps, 500000bps.

Byte format: 8-N-1.

The communication protocol between the Host and ACR1281S is very similar to the CCID

protocol.

Command Frame Format

STX

(0x02)

Bulk-OUT Header APDU Command

Parameters

Checksum

ETX

(0x03)

1 Byte 10 Bytes M Bytes

(If applicable)

1 Byte 1 Byte

NOTE: Checksum = XOR {Bulk-OUT Header, APDU Command or Parameters}

Status Frame Format

STX

(0x02)

Status Checksun

ETX

(0x03)

1 Byte 1 Byte 1 Byte 1 Byte

NOTE: Checksum = Status

Response Frame Format

STX

(0x02)

Bulk-IN Header APDU Response

abData

Checksum

ETX

(0x03)

1 Byte 10 Bytes N Bytes

(If applicable)

1 Byte 1 Byte

NOTE: Checksum = XOR {Bulk-IN Header, APDU Response or abData}