Manual

7
6 Command Types
There are 3 types of packet to be sent to the radio from the PC:
Short packet
Long packet
Direct packet
These are described in the following sections.
6.1 Short packet
This is used to send out single instruction to the radio to carry out functions
like setting serial or parallel mode of operation, setting the serial channel
number etc.
For the short packet the 8 data bytes to be transmitted are:
X product ID. For the SRn00 = 0F6 hex and for STn00 = 0F5 hex
A EEPROM address or DATA1
B EEPROM data byte or DATA2
C not used (0) or DATA3
D not used (0) or DATA4
COM command byte
chkH check sum hi byte } A + B + C + D + COM
chkL check sum lo byte }
Note: This data is sent out at 19200 baud as detailed in section 2. Each
data byte within the packet should be separated by 10 to 15 msec.
delay and the delay between 2 successive packets should be > 100
msec.
The Command (COM) byte is defined as follows:
6.1.1 COM # 63 dec
This denotes a long packet as described in section 6.2 for re-programming
the EEPROM area.
6.1.2 COM = 64 dec
This is the direct packet mode as described in section 6.3 and is used to
change the channel of the unit.