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GEM for SIPLACE V7.01

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The following transitions can occur. Transitions of the Communication Finite State

Machine diagram do not cause the SIPLACE to signal any Collection Event ID (CEID), nor

to send Event Reports to the Host.

# From Trigger To Description

1 Unknown Power-Up Conditional Equipment will initialize

itself to either the

Disabled or Enabled

state, depending on the

configuration of the EC

INITCOMMSTATE (VID

1002002).

2 Disabled Button

„Connect“ is

pressed in the

„GEM-Status“

screen

Enabled Equipment will attempt to

establish

communications with the

Host. The SIPLACE will

periodically send a

Connect Request at an

interval dictated by the

ESTABLISHCOMMUNIC

ATIONSTIMER (VID

1002003).

3 Enabled Button

„Disconnect“ is

pressed in the

„GEM-Status“

screen

Disabled Communications are

abruptly terminated. Any

outstanding messages

queued for send are

discarded. The

Equipment will not

respond to a Host-

initiated ENQ.

4 Disabled or

Power-Up

Request has

been made for

the SIPLACE to

start

communicating.

Not

Communicating

Equipment immediately

attempts to establish

communications with the

Host. The SIPLACE will

periodically send a

Connect Request

message at an interval

dictated by the EC

ESTABLISH-

COMMUNICATIONSTIM

ER (VID 1002003).

5Not

Communicatin

Successful

completion of

Connect

Request

transaction.

Communicating The Host / Equipment

link is „up“. Normal

SECS transactions can

occur.

6 Communicatin

communications

failure has

occurred.

Not

Communicating

Equipment immediately

attempts to establish

communications with the

Host. The SIPLACE will

periodically send a

Connect Request

message at an interval

GEM for SIPLACE V7.01

# From Trigger To Description

dictated by the EC

ESTABLISH-

COMMUNICATIONSTIM

ER (VID 1002003).

GEM for SIPLACE V7.01

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The current Communication State will be one of the following values. There is no Variable

indicating the Communication State. The communication State is presented to the

Operator on the main Operator Interface screen.

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The SECS link to the Host is disabled at the SIPLACE. The Equipment will send no

messages to the Host. The Equipment will not respond to a Host-initiated ENQ.

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When communications are Enabled, the Equipment's intention is to be in communication

with the Host. Whether or no the SIPLACE is currently communicating with the Host

determines which sub-state of the Enabled super-state the SIPLACE is in.

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The SECS link between the SIPLACE and the Host is operating normally.

Periodically, the Equipment will send a "Heartbeat" message S1F1 to ensure that the link

is still operating. The heartbeat frequency is controlled by Equipment Constant

HEARTBEAT. HEARTBEAT (VID 1002055) can range from 0 to 32000, with default

value 30.

If the Equipment encounters a SECS-I Retry Limit (RTY) error when attempting to send a

block to the Host, it discards any messages queued for send and the communication state

transits to ENABLED.

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The SECS link to the Host is enabled at the SIPLACE, and the Equipment is attempting to

determine if the link is active. The Equipment periodically sends S1F13 (Establish

Communications Request).

If the connect is not successful for any reason, the Equipment will try again periodically

forever. The time between attempts is controlled by the Equipment Constant

ESTABLISHCOMMUNICATIONSTIMER. This variable (VID 1002003) can range from 0

to 32000 seconds, with default of 60 seconds.

Once the Host has responded with S1F14 (Establish Communications Acknowledge), the

Communication State will change to COMMUNICATING.

The Host can also attempt to establish communications by sending S1F13. The

Equipment will accept the message and respond with S1F14 and the Communication

State will change to COMMUNICATING.

In ENABLED state, the SIPLACE will accept messages from the Host, but will ignore any

messages except S1F13 and S1F14. The SIPLACE will respond to the S1F13 while the

Communication State is ENABLED or COMMUNICATING, but it will not send S1F13 once

communications have been established.

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At Power Up (or System Start), the Equipment Constant INITCOMMSTATE (vid

1002002) controls whether state is initialized to DISABLED or ENABLED. The factory

setting is DISABLED.