CDM-Qx Satellite Modem Revision 4
Remote Control MN/CDMQx.IOM
C-4
C.4.2 Address
Up to 9999 devices can be uniquely addressed. The RS-485 base address is set by the
front panel; the RS-232 base address is always zero. Each plug-in slot (as viewed from
the back of the chassis) has its own address.
Slot Address
Upper Left Base
Lower Left Base + 1
Upper Right Base + 2
Lower Right Base + 3
Common functions can be accessed through any of the four addresses. If several
devices share a RS-485 bus, it must be noted that the Qx will require four addresses,
and should be spaced apart accordingly. Empty slots in the Qx chassis still occupy an
address.
IMPORTANT
A single CDM-Qx occupies four addresses. For modulator and demodulator
grouped as modem, the address will be the same as the modulator.
C.4.3 Instruction Code
This is a three-character alphabetic sequence that identifies the subject of the message.
Wherever possible, the instruction codes have been chosen to have some significance.
For example: TFQ for transmit frequency
RMD for receive modulation
This aids in the readability of the message, should it be displayed in its raw ASCII
form. Only upper case alphabetic characters may be used (A – Z, ASCII codes
65 – 90).
