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XStream-PKG-R™ RS-232/485 RF Modem – Product Manual v4.2B5

SY Command allows the modems to remove this information from the RF Initializer after the

initial synchronization. For example, changing the SY Parameter to 0x14 (20 decimal) allows all

modems to remain in sync for 2 seconds after the last data packet was received. Synchronization

information is not re-sent unless transmission stops for more than 2 seconds. This command

allows significant savings in packet transmission time.

Warning: Not recommended for use in an interference-prone environment. Interference can

break up the session and the communications channel will not be available again

until SY time expires.

With SY set to zero, the channel session is opened and closed with each transmission - resulting

in a more robust link with more latency.

TR (Transmit Error Count) Command

<Diagnostics> TR Command records the number

of retransmit failures. This number is

incremented each time a packet is not

acknowledged within the number of retransmits

specified by the RR (Retries) Command. It

therefore counts the number of packets that were

not successfully received and have been dropped.

The TR Parameter is not non-volatile and will

therefore be reset to zero each time the modem

is reset.

TT (Streaming Limit) Command

<Networking> TT Command defines a limit on

the number of bytes that can be sent out before

a random delay is issued. TT Command is used to

simulate full-duplex behavior.

If a modem is sending a continuous stream of RF

data, a delay is inserted which stops its

transmission and allows other modems time to

transmit (once it sends number of bytes specified

by TT Command). Inserted random delay lasts

between 1 and “RN + 1” delay slots, where each

delay slot lasts 38ms.

VR (Firmware Version) Command

<Diagnostics> Read the Firmware Version of the

XStream Modem.

WR (Write) Command

<(Special)> WR Command writes configurable

parameters to the modem’s non-volatile memory

(Parameter values persist in the modem’s

memory until overwritten by future use of WR Command).

If changes are made without writing them to non-volatile memory, the modem reverts back to

previously saved parameters the next time the modem is powered-on.

AT Command: ATTR

Binary Command: 0x1B (27 decimal)

Parameter Range: 0 – 0xFFFF

Default Parameter Value: 0

Number of bytes returned: 2

Related Commands: RR (Retries)

Minimum Firmware Version Required: 4.22

AT Command: ATTT

Binary Command: 0x1A (26 decimal)

Parameter Range: 0 – 0xFFFF (0 = disabled)

Default Parameter Value: 0xFFFF (65535

decimal)

Number of bytes returned: 2

Related Commands: RN (Delay Slots)

Minimum Firmware Version Required: 4.22

AT Command: ATVR

Binary Command: 0x14 (20 decimal)

Parameter Range: 0 – 0xFFFF (Read-only)

Number of bytes returned: 2

AT Command: ATWR

Binary Command: 0x08