Visara LINCS Central Control - Manual (Page 171)

165
Chapter 14. Online Testing
707024-002
A Command Complete CHC message should be received from the CHC in response to this
CC command.
The format of the description and extended data is:
• Reset Processed Seq # = xx
Set Direction Inbound (Non-SNA only)
This CC command is issued to the CHC during a Non-SNA Select Read Buffer from Position
or Select Read Modified from Position channel command sequence to indicate to the CHC
that it should prepare for an inbound data transfer.
A Command Complete CHC message should be received from the CHC in response to this
CC command.
The format of the description and extended data is:
• Set Dir. Inbound
Accept Next Channel Command (Non-SNA only)
Following the completion of an outbound data transfer to LINCS (the data transfer has
completed, CE has been presented, DE is pending), if the destination device is a printer or
DFT, this command is issued to the CHC to indicate that it can accept another command even
though final ending status is pending from the address associated with the device.
A Command Complete CHC message should be received from the CHC in response to this
CC command.
The format of the description and extended data is:
• Accept Next Ch. Cmd.
Change Device Status (Non-SNA only)
This command is issued to the CHC to indicate that a device attached to the LINCS node has
become unavailable or available. The channel address associated with the device is also included
with the command.
A Command Complete CHC message should be received from the CHC in response to this
CC command.
The format of the description and extended data is:
• Change Device Status Addr = xx Flags = xx
Change Buffer Status (SNA only)
This command is issued to the CHC to indicate a change in resource availability in the LINCS
node. This message will indicate one of four possible resource conditions.
• No buffers available for a specific address
• Buffers available for a specific address
• No buffers available for all addresses
• Buffers available for all addresses
When no buffers are available for a specific address or for all addresses, any subsequent write
type command on the channel will be rejected with the appropriate status indication. If the host
is notified of a no buffers available condition for a specific address, the host will be notified via
an asynchronous status x‘44’, SM,DE, when buffers become available for that address.
When buffers become available for an address, if the host had not been notified of the no