Comtech EF Data CDM-600/600L - Manual (Page 261)

CDM-600/600L Open Network Satellite Modem Revision 3
Appendix G MN/CDM600L.IOM
G–3
G.2 Message Structure
G.2.1 Command Message Structure (CDM-600L to BUC)
Byte Name Description Value
1 Address Address of BUC 0x01 to 0x0f
2 Command
Request Status
Tx On/Off
Change Address
Set Carrier Frequency 0x01
0x02
0x03
0x04
3 Data Byte 1
Not used if command: = 0x01
Tx control if command: = 0x02
New address if command: = 0x03
Carrier Frequency if command: = 0x04
0xAA
0=Off, 1=On
0x01 to 0x0f
MSbyte
4 Data Byte 2
Not used if command: = 0x01
Not used if command: = 0x02
Not used if command: = 0x03
Carrier Frequency if command: = 0x04
0XAA
0xAA
0xAA
LSbyte
5 Data Byte 3 Not Used 0xAA
6 Data Byte 4 Not Used 0xAA
7 Checksum Algebraic sum of bytes 1 - 6
G.2.2 Response Message Structure (BUC to CDM-600L)
Byte Name Description Value
1 Address Address of BUC shifted left by 4 0x10 to 0xf0
2 Level Byte 1 MSbyte of TX output power
3 Level Byte 2 LSbyte of TX output power
4 Temperature Temperature in °C
5 Status Byte 1 Bit 0: Temperature out-of-range
Bit 1: PLL out-of-lock
Bit 2: Checksum error
Bit 3: TX Status
Bits 4 thru 7: Power Class 1: OOR, 0: Normal
1: OOL, 0: Normal
1: error in command
message, 0: Normal
1: TX ON, 0: TX Off
0x1 to 0xf
6 Status Byte 2 Bits 0 – 3: Not used
Bits 4 –7: Software version 0xAA
0x0 to 0xf
7 Checksum Algebraic sum of bytes 1 - 6
Data Field Definitions
TX Power Level Unsigned integer in 1/100 dBm
Carrier Frequency Unsigned integer in MHz.
Termperature Signed character in
°C