Datum Systems PSM-500L Manual do Utilizador descarregar pdf (Página 6)

Datum Systems, Inc. PSM-500 Modem Remote Control Protocol

Rev 0.93 12/12/10

B-6

Here in compressed format is the exchange between the controller with address 0xCC and a

modem with address 1. The first hexadecimal character before the “:” is the byte number.

Send: a5 01 cc 41 05 00 96 b2 To Unit 1

Received 45(0x2d) bytes, Data count 36(0x24)

00: 5a cc 01 41 76 00 24 00 00 00 00 02 00 08 00 80

10: 1d 2c 04 00 00 00 00 00 00 9c ff 3c 00 32 00 a2

20: fe 00 00 00 00 00 00 00 00 00 00 96 e8

Expanding the data portion of the response which starts at byte 7 above is:

Byte 0-3 – 00 - hex – Change Flags - No Changes since last read

Byte 4 – 02 hex – Carrier disabled, QPSK mode

Byte 5 – 00 hex – No Preamble, No Burst

Byte 6 – 08 hex – AUPC Off, Mute Automatic, 75 Ohm

Byte 7 – 00 hex - Spares

Bytes 8-11 – 80 1D 2C 04 hex – Frequency = 70.000000 MHz (Hex = 04 2C 1D 80).

Bytes 12-13 – 00 00 hex – Used for L-Band

Bytes 14-17 – 00 00 00 00 hex – No Carrier Offset

Bytes 18-19 – 9C FF hex – Minus 10.0 dBm output level (FF 9C Hex = -10.0 in 0.1dB steps)

Bytes 20-21 – 3C 00 hex – AUPC Eb/No setting (00 3C Hex = 6.0 in 0.1dB steps)

Bytes 22-23 – 32 00 hex – AUPC Max Cxr level allowed (00 32 Hex = +5.0 in 0.1dB steps)

Bytes 24-25 – A2 FE hex – AUPC Min Cxr Level. (FE A2 Hex = -35.0 in 0.1dB steps)

Bytes 26-35 – 00 00 00 00 hex – Spare

This response said that the modem was set to 70.000000 MHz, so the IF frequency parameter must be

changed. Note that only the packet byte sequence is given below.

2. Program the modem transmit frequency.

Here is the exchange between the controller and a the same modem with address 1:

Send To Unit 1:

00: a5 01 cc 41 05 24 01 00 00 00 02 00 08 00 60 19

10: 73 04 00 00 00 00 00 00 9c ff 3c 00 32 00 a2 fe

20: 00 00 00 00 00 00 00 00 00 00 96 ea

Received 45(0x2d) bytes, Data count 36(0x24)

00: 5a cc 01 41 76 00 24 05 00 00 00 02 00 08 00 60

10: 19 73 04 00 00 00 00 00 00 9c ff 3c 00 32 00 a2

20: fe 00 00 00 00 00 00 00 00 00 00 96 c0

mif Change Failed!

Command packet from controller to set the transmit frequency to 74.652 MHz:

Packet Start - “A5 0C C8 41 01 24”

Data Bytes:

Byte 0 – 01 hex – Change the Transmit Frequency Only

Byte 1-3 – 00 hex – No other changes

Byte 4 – 02 hex – Carrier disabled, QPSK mode (ignored by modem)

Byte 5 – 00 hex – No Preamble, No Burst(ignored by modem)

Byte 6 – 08 hex – AUPC Off, Mute Automatic, 75 Ohm (ignored by modem)

Byte 7 – 00 hex - Spares

Bytes 8-11 – 60 19 73 04 hex – Frequency = 74.652000 MHz

Bytes 12-13 – 00 00 hex – Used for L-Band

Bytes 14-17 – 00 00 00 00 hex – No Carrier Offset

Bytes 18-19 – 9C FF hex – Minus 10 dBm output level (Shown but ignored)

Bytes 20-21 – 3C 00 hex – AUPC Eb/No setting (00 3C Hex = 6.0 in 0.1dB steps)

Bytes 22-23 – 32 00 hex – AUPC Max Cxr level allowed (00 32 Hex = +5.0 in 0.1dB steps)

1 2 3 4 5 6 7 8 9 10 11 ... 56 57

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