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TC12 General Handbook

666/HB/43100/000 Page 5-17 Issue 9

5.6.4 Configurable options

If no loops are configured for HIOCC then the HIOCC facility will not be enabled.

Note: The default settings below are applied on first time startup or complete OTU reset. Any

alterations made by the handset are maintained across power failures.

Configurable options include thresholds for:-

a) Occupancy alarm threshold, which is used to determine alarm conditions. Handset command

for entry of this value is GHA.

b) Timed zero occupancy. The handset command used to configure this will be GHZ.

c) Smoothed occupancy high value used on alarm detection. The handset command for setting

this is GHV.

d) HIOCC loop input allocation, assigns an input bit for each HIOCC unit. The handset command

for this is GHL.

e) The number of consecutive occupancy samples used to determine if an alarm condition

exists, range 0 to 10. Handset command GHN.

f) The smoothing factor used in calculating the new smoothed occupancy. The handset

command for this is GHF.

g) The fixed clearance threshold is used to determine an alarm clearance condition in the event

that the smoothed occupancy average is at a abnormal level prior to an alarm. It has a

range of 0-100%. The handset command to configure this is GHC.

h) UTC Reply message bits must be set by using the handset command GRL. There will be a

separate bit allocated for each loop monitored by HIOCC. A maximum of 8 reply bits can be

configured for HIOCC.

5.6.5 Instation Test Set

The Instation test set is used to monitor and test the operation of the TC12 system when using

analogue data transmission. It can be used at all the TC12 baud rates (See section 5.1.1) and at

any signal level between 0dBm and -63dBm. There is a pair of headphones connected to the ITS

which allows the user to listen to both control and reply messages.

Whichever mode the ITS is operating in the physical connection to the unit under test does not

change.

There are three modes of operation for the ITS:

5.6.6 Monitor Mode

When the ITS is operating in this mode the operation of any key (except the mode selection key)

has no effect on the data being transmitted between the instation and the OTU.

Connecting the ITS (in this mode) to the OTU or ITU does not cause an error in the data being

transmitted between the instation and the OTU for more than one second.

5.6.7 Instation Mode

In this mode the ITS replaces the computer and the instation equipment. The ITS transmits at one

second intervals to a selected OTU, a control message in accordance with the display setup.

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