The document specifies additional commands for a CRT-188 card reader. It details commands to read and write the card reader's serial number (S/N). The read command returns the S/N as an ASCII string up to 16 bytes, or a failure code. The write command accepts an ASCII S/N string up to 16 bytes and returns a success or failure code. Both commands use a standard header and response format with status and length fields.

1. Model No. CRT-188
SPECIFICATION Date 2006/07/16
Card reader additional Ver. 1.0
command specification Page 1/1
Attachment: CRT-188 card reader additional commands specification
1. Read the card reader S/N
Host send:
0x02 0x00 0x02 0x30 0x3A 0x03 BCC
Reader operation success, return： Ｐ＝0X59
0x02 Length 2byte 0x30 0x3A Operation Len Data package of 0x03 BCC
status: P (1byte) card reader S/N
(n byte)
Length= 4 + n byte
Len : The length of card reader S/N data package（0 ~ 16 byte）
Data package of card reader S/N ：Stored by ASCII code：
E.g. the data of card reader S/N: “CRT-284”, then the data package of card reader S/N:
“ 0x43,0x52,0x54,0x2D,0x32,0x38,0x34”
Reader operation failure, return： Ｐ＝0X4E
0x02 0x00 0x03 0x30 0x3A Operation 0x03 BCC
status: P
2. Write the card reader S/N
Host send:
0x02 Length 2byte 0x30 0x3B Len (1byte) Data package of card 0x03 BCC
reader S/N
(n byte)
Reader return：
0x02 0x00 0x03 0x30 0x3B Operation 0x03 BCC
status: P
Len : the length of card reader S/N data package（0 ~ 16 byte）
Operation status P = 0x59 success
= 0x4e failure
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