HORNER HE200WCM910 User Manual page 39

RS‐232/485 RF Modem Product Manual – MAN0782‐02
MK (Address Mask) Command
MT (Multi-Transmit) Command
MY (Source Address) Command
<Networking & Security> MK Command is used
to set/read the "Address Mask". All data packets
contain the Destination Address of the
transmitting modem.
When an RF data packet is received, the
transmitter's Destination Address is logically
"ANDed" (bitwise) with the Address Mask of the
receiver. The resulting value must match the
Destination Address or the Address Mask of the
receiver for the packet to be received and sent
out the modem's DO serial port. If the "ANDed"
value does not match either the Destination
Address or the Address Mask of the receiver, the packet is discarded. (All "0" values are treated
as "irrelevant" values and are ignored.)
<Networking & Security> MT packets do not
request an acknowledgement from the receiving
modem(s). MT takes precedence over RR, so if
both MT and RR are non-zero, then MT+1 packets
will be sent, with no ACK requests.
When a receiving modem receives a packet with
remaining forced retransmissions, it calculates
the length of the packet and inhibits transmission
for the amount of time required for all
retransmissions. Thereafter, a random number of
delay slots are inserted between 0 and RN before transmission is allowed from the receiving
modem(s). This prevents all listening modems from transmitting at once upon conclusion of a
multiple transmission event, as long as RN is non-zero.
Comment: Actual number of forced transmissions is the parameter value plus one. For example,
if MT=1, two transmissions of each packet will be sent.
<Networking & Security> Set/Read the source
address of the modem.
AT Command: ATMK
Binary Command: 0x12 (18 decimal)
Parameter Range: 0 – 0xFFFF
Default Parameter Value: 0xFFFF (65535d)
Destination address (DT parameter) of the
transmitting modem must exactly match the
destination address of the receiving modem.
Number of bytes returned: 2
Related Commands: DT (Destination Address),
HP (Hopping Channel), ID (Modem VID), MY
(Source Address)
AT Command: ATMT
Binary Command: 0x3D (61 decimal)
Parameter Range: 0 – 0xFF
Default Parameter Value: 0 (no forced
retransmissions)
Number of bytes returned: 1
Related Commands: Networking (DT, MK, MY,
RN, TT), Serial Interfacing (BR, PK, RB, RO), RF
Interfacing (FS)
AT Command: ATMY
Binary Command: 0x2A (42 decimal)
Parameter Range: 0 – 0xFFFF
Default Parameter Value: 0xFFFF (Disabled –
DT (Destination Address) parameter serves as
both source and destination address.)
Number of bytes returned: 2
Related Commands: DT (Destination Address),
HP (Hopping Channel), ID (Modem VID), MK
(Address Mask)
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