Sierra Video 507125 - Manual (Page 10)

Sierra Video Systems SmartLinx Bus Adapter busadap.doc
10
H
(High Speed)
Any
→ → → →
Poller Requests a temporary change in the EIA-485 bus data rate. The Bus Adapter sends
this message when a host application requests that a message be sent in high-
speed mode.
h
(High Speed)
Poller
→ → → →
All Announces a temporary change in the EIA-485 bus data rate. The Bus Adapter
receives messages on the bus at the higher speed for the specified time.
L
(Loopback)
Any → → → → Bus Adapter Loopback send diagnostic message. The Bus Adapter sends data back to the sender
using an “l” message.
l
(Loopback)
Bus Adapter → → → → Any Loopback reply diagnostic message, sent in response to receiving an “L“ message.
N
(Name)
Any
→ → → →
Bus Adapter Changes the Bus Adapter’s module name, or queries for the current module name.
The Bus Adapter sends an “n” message in response.
n
(Name)
Bus Adapter
→ → → →
Any The Bus Adapter reports its name in response to receiving an “N” message.
P
(Poll Params)
Bus Adapter
→ → → →
Poller At startup, the Bus Adapter sends this message to set its polling parameters so that
it will be repolled immediately, up to 20 times, whenever it sends a message.
Whenever a host application allocates a SmartLinx address, this message is sent to
enable periodic polling and idle polling of the host application. When the
application deallocates its address, this message is sent again to disconnect the
device, reduce the polling frequency of the address, and terminate idle polling. After
receiving an “r” message from the poller, this message is sent several times to the
poller to reestablish the polling parameters that were probably lost when it reset.
R
(Reset)
Any → → → → Bus Adapter The Bus Adapter resets itself as if just powered up after receiving this message.
r
(Reset)
Bus Adapter → → → → All The Bus Adapter sends this message at startup to announce that it has just started
up.
r
(Reset)
Poller → → → → Bus Adapter When the Bus Adapter receives an “r” message from the poller, it sends “P”
messages to the poller to reestablish polling parameters of itself and its
applications. See the “P” message above for more information.
T
(Type)
Any
→ → → →
Bus Adapter Changes the dash number, serial number, and hardware version number of the Bus
Adapter (catalog number and software version number cannot be changed), or
queries for the catalog number, dash number, serial number, hardware version
number, software version number, reset flag, and settings1/2. The Bus Adapter
sends a “t” message in response. Unlocking (“U” command) is required before any
parameters can be changed. These parameters must only be changed by the factory.
t
(Type)
Bus Adapter
→ → → →
Any The Bus Adapter reports its catalog number, dash number, serial number, hardware
version number, software version number, reset flag, and settings 1/2. It sends this
message as a general broadcast to all devices whenever it establishes (or
reestablishes) a connection with the poller, e.g. at power-up and any time the
connection between the poller and Bus Adapter is dropped for some reason. This
message is also sent to the sender of a “T” message. The Bus Adapter hardware
version number is two ASCII characters (2-digit PLD dash number), and the software
version number is five ASCII characters (V#.##). Settings1 is TRUE iff the Bus
Adapter is polling enabled. Settings2 is the SmartLinx bus address corresponding
the frame and slot ID values of the Bus Adapter (the Bus Adapter’s SmartLinx
address is determined by the setting of rotary switches S1-S2). Settings3 is the DIP
switch setting. Settings4 is the rotary switch S1-S2 setting. Settings5 is the rotary
switch S3-S4 setting.
U
(Unlock)
Any → → → → Bus Adapter Unlocks certain Bus Adapter commands, such as the ability to modify the dash
number, serial number, and hardware version number.
W
(Which)
Any
→ → → →
Bus Adapter Request for the Bus Adapter to send a “w” message reporting the message
bytes it understands and/or sends.
w
(Which)
Bus Adapter
→ → → →
Any The Bus Adapter reports the message bytes it understands and/or sends, in
response to receiving a “W” message.
Table 4: Universal Messages Understood or Sent by Bus Adapter Modules