User`s guide

Node

Reset

Flush

Receive

niFLUSHCANCEL

Receive niCOMM

or niNETMGMT?

Available?

output

5 Upon receiving the niACK acknowledgment, the network driver

transfers the entire interface buffer to the SLTA-10 Adapter. This

Available?

Receive niCOMM

or niNETMGMT

message?

L(czi&Jm

Note: niNETMGMT commands are allowed in the Flush state.

Figure 9.5 SLTA-10 Adapter Downlink Flow Control States

Following is the sequence of events for transferring an nicoMM or

niNETMGMT command downlink to the SLTA-10 Adapter:

The SLTA-10 Adapter is initially in the NORMAL state.

2 The network driver requests an output buffer by sending a link-layer

header (see figures 9.2 and 9.3) with a niCOMM or niNETMGMT command

andtheappropriatequeuevalue (niTQ,niTQ-P,niNTQ,niNTQ_P).

The data portion of the interface buffer is not sent with the buffer

request. This puts the SLTA-10 Adapter in the OUTPUT QUEUE

REQUESTED state.

3 If an output buffer is not available, the SLTA-10 Adapter responds with

a niNACK (OxCl) command. The SLTA-10 Adapter returns to the

NORMAL state, and the driver starts again at step 2.

4 When an output buffer is available, the SLTA-10 Adapter responds with

a niACK (OxCO) command. The SLTA-10 Adapter is now in the OUTPUT

QUEUE ACKNOWLEDGED state. While in this state, the network driver

can only transfer downlink LonTalk messages, uplink source quench

commands (niPUPXOFF), uplink source resume commands (niPUPXON),

or reset commands (niRESET) since the SLTA-10 Adapter is waiting for

a message in this state. All other network interface commands sent

downlink will be ignored, and will return the SLTA-10 Adapter to the

NORMAL St&!.

9-12

Creating an SLTA-10 MIP Mode Driver