Specifications

P25 Development Guide

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Please see Figure 4.

Figure 4: DATA Field Description

Each byte in the DATA field should be in HEX code; the highest byte should be transmitted first in

the same way DATA Length is transmitted.

3.4.3 Format of Download Frame

C0H

(SOF)

‘F’(0x46)

(TOF)

C1H

(EOF)

 This frame just indicates that the following frame is an erasing or a writing flash frame.

3.4.4 Format of ENQ Frame

C0H(SOF) 0x05(TOF) C1H(EOF)

 It is recommended that the host send the same ENQ frame up to 10 times with 400ms time

interval pauses in case there is no response from the printer.

3.4.5 Format of Frame of request to MSR

C0H

(SOF)

‘H’(0x48)

(TOF)

DATA ID

Number

DATA

Length

DATA

CHECK

SUM

C1H

(EOF)

 The DATA Length is fixed to 2

 The DATA field just is the time to wait to pull the MSR. The first byte is the MSB.

z the time valid value: 0 (DATA: “00”)~ 30(DATA: “30”) seconds

z other time value: pull the MSR forever

 The other fields is same as section 3.2.1

 eg.

Index 0 1 2 3 4 5 6 7 8 9 10 11

data C0 48 30 30 30 30 32 32 30 32 30 C1

0. Frame head

1. TOF

2. DATA ID

3-6. DATA Length(its value fix to 2)

7,8. Wait time (this example set to 20 seconds)

9,10. CRC

11. Frame tail