Renesas FLASH Development Toolkit 3.07 Manuál s instrukcemi stáhnout pdf (Strana 37)

Designing and Planning an M2150 System

Access Control Design Guide

Cable Supervision

Determine the level of cable supervision required for cables to door monitors, exit-request buttons and

monitor points. This allows short-circuit, open-circuit and tamper conditions to be detected, depending on

the termination resistors added to the end of the cable (i.e. as near as possible to the monitor-point

contact, etc.). The SMS software can generate an alarm or event for any cable fault or tamper condition.

There are two-state, three-state, four-state and six-state supervision levels, as described next. The level of

supervision can be different for each contact used, and must be configured in the Install screens of the

SMS software.

Note: Monitor points connected to an ENVS can use only two-state supervision.

Two-State Supervision

The term "two-state supervision" means that the cable is not monitored for faults. No additional resistors

are used at the end of the cables, as shown in Figure 2-5.

Figure 2-5: Two-State Supervision

Three-State Supervision

Three-state supervision uses the cable termination shown in Figure 2-6. If three-state supervision is used

and the contact is normally open, only an open circuit on the cable can be detected. If the contact is

normally closed, only a short-circuit can be detected.

Figure 2-6: Three-State Supervision

Four-State Supervision

Four-state supervision uses the cable termination shown in Figure 2-7. In the case of four-state

supervision, both short-circuits and open-circuits on the cable can be detected.

Figure 2-7: Four-State Supervision

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 72 73

Žádné komentáře

Renesas FLASH Development Toolkit 3.07 Manuál s instrukcemi Strana 37