OP-SB85IR Infrared Communications Expansion Kit (IrDA, ASK)

Outline

This expansion kit is provided with a probe pod for monitoring IrDA (SIR, MIR, and FIR) and ASK infrared communications.
The kit has an IrDA monitor function that makes it possible to change communications speed automatically according to the IrLAP protocol and allows the seamless monitoring of infrared data, the mode of which changes from SIR (9600 bps) to FIR (4 Mbps).
The kit has two optical emission levels (high and low levels), either one of which is selectable, and incorporates an analog waveform analysis function as well.

Auto Detection based On Communication Speed of IrDA

In general, Infrared communications of the IrDA protocol starts to measure at 9600bps and changes speed while communicating. The general protocol analyzers cannot correspond to change of the measuring condition while measuring. So, IrDA data cannot be measured when communicating. By using the analyzer and OP-SB85IR, the analyzer can analyze the SNRM command and the UA response of the IrLAP procedure, and automatically detect communication speed of IrDA and the frame format. Therefore, you can continuously monitor the change of data.

IrDA(SIR/MIR/FIR) Support

The communication frame format of SIR/MIR/FIR is automatically set based on communication speed. Usually, when IrDA is monitored, setting 9600bps enables you to start the measurement. When communication speed is 2400bps, 9600bps, 19.2Kbps, 38.4Kbps, 57.6Kbps or 115.2Kbps, it will become the SIR format.

Frame Format	Asynchronous Standard [ BOF ]+[ ADDR ]+[ control ]+[ information ]+[ FCS ]+[ EOF ]
Data Transmission Procedure	Escape Code 7D *If the control code of C0 (BOF), C1(EOF) or 7D is transmitted as data, insert 7D to the head of data and transmit data XORed with each control code by 20h C0(BOF) -> 7D E0 C1(EOF) -> 7D E17D -> 7D 5D
Abort	7D C1

When communication speed is 0.576Mbps or 1.152Mbps, it will become the MIR format.

Frame Format	HDLC Standard [ STA ]+[ STA ]+[ ADDR ]+[ control ]+[ information ]+[ FCS ]+[ STO ] STA : Start Flag, 01111110 binary ADDR : 8 bit Address Field Control : 8 bit Control Field Information : Information Field Max. 2045 = (2048 - 3) bytes FCS : CCITT 16 bit CRC STO : Stop Flag, 01111110 binary
Abort	If 1 continues seven times without optical signals

When communication speed is 4Mbps, it will become the FIR format.

Frame Format

4 Pulse Position Modulation (4PPM) encoding system [ PA ]+[ STA ]+[ ADDR ]+ [ control ]+[ information ]+[ FCS ]+[ STO ] PA : Preamble, 1000 0000 1010 1000 binary STA : Start Flag, 0000 1100 0000 1100 0110 0000 0110 0000 binary ADDR : 8 bit Address Field, 4PPM format control : 8 bit Control Field, 4PPM format information : Information field Max. 2045 = (2048 - 3) bytes FCS : CCITT 32 bit CRC, 4PPM, format CRC(x)=x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 STO : Stop Flag, 0000 1100 0000 1100 0000 0110 0000 0110 binary

Abort

All the patterns against 4PPM

Translation Display on the Stream of IrDA Data

Even if monitoring, you can switch from the data display screen to the translation display screen by pressing the [Data] key. You will be able to analyze the contents in the control field of IrDA communications data frame in detail.

<Example of Data Display>

Display meaning SD Indicates the frame for SD. RD Indicates the frame for RD. Time Displays the time when the frame is received. (*1) Ad Displays the contents of the address field in HEX. Type Displays the frame type in mnemonic code. NS Displays the frame sequence number in a decimal. PF Displays the logic of PF bit. NR Displays the frame sequence number in a decimal. FC Displays the results of the block check. Ifield Displays the head data of information field in HEX. *1: To display this item, you need to set “Time stamp” to be something except “Off” at “ Record Control”.

U (unnumbered) Format : when both bit 0 and 1 are 1

7	6	5	4	3	2	1	0	Type of Command / Response
1	0	0	P	0	0	1	1	SNRM (Set Normal Response Mode) command
0	1	0	P	0	0	1	1	DISC (Disconnect) command
0	0	0	P	0	0	1	1	UI (Unnumbered Information) command
0	0	1	P	1	1	1	1	XID (exchange station identification) command
1	1	1	P	0	0	1	1	TEST command
1	0	0	F	0	0	1	1	RNRM (request normal response mode) response
0	1	1	F	0	0	1	1	UA (unnumbered acknowledgment) response
1	0	0	F	0	1	1	1	FRMR (Frame Reject) response
0	0	0	F	1	1	1	1	DM (disconnected mode) response
0	1	0	F	0	0	1	1	RD (Request disconnect) response
0	0	0	F	0	0	1	1	UI (Unnumbered Information) response
1	0	1	F	1	1	1	1	XID (exchange station identification) response
1	1	1	F	0	0	1	1	TEST response

S (supervisory) Format : When bit 0 is o and Bit 1 is 1

7	6	5	4	3	2	1	0	Type of Command / Response
Nr	Nr	Nr	P/F	0	0	0	1	RR (receive ready) command/response
Nr	Nr	Nr	P/F	0	1	0	1	RNR (receive not ready) command/response
Nr	Nr	Nr	P/F	1	0	0	1	REJ (reject) command/response
Nr	Nr	Nr	P/F	1	1	0	1	SREJ (selective reject) command/response

I (information) Format : when bit 0 is 1

7	6	5	4	3	2	1	0	Type of Command / Response
Nr	Nr	Nr	P/F	Ns	Ns	Ns	1	INFO (information) command/response

Specification

Interface	Infrared rays Photodiode/LED: HSDL-3602 or equivalent
Measurement Signal	SD, RD
Protocol	IrDA1.1 (SIR/MIR/FIR), ASK
Baud Rate (bps)	2400, 9600, 19.2K, 38.4K, 57.6K, 115.2K, 0.576M, 1.152M, 4M (*1) Automatically detects and follows IrLAP protocol
Communications test function	Monitor / Simulation
Output Emission Level	High/Low interchangeable (*2)
Analog waveform analysis	The signal voltages of 2 channels are measured and displayed in analog waveform Sampling: 1 MHz to 40MHz (in 6 steps), 4K points Measurement range: ±6 V/±12 V
Composition	Dedicated expansion board, relay cable, IrDA probe pod, 3-wire probe cable

(*1) Restricted by analyzer performance.
(*2) Set from analyzers.