Myalarm V-LCD1 Instrukcja Obsługi Pobierz pdf (Strona 66)

NETWORKING

7-60

System 2 Installation / Programming Manual

RS485 Wiring

Attach the two wires from the RS485 line to Terminals #14 & #15. Be sure the polarity is observed from the

Master board to any Slaves (additional System 2's ) attached to the network. For example, most twisted pair

cables have a copper conductor and a tin plated conductor. Attach the tin conductor to Teminal #14 and the

copper conductor to Terminal #15. All connections should wire directly to the screw terminals on the circuit

board - do not make any “pig-tail” connections from the main RS485 buss.

IMPORTANT: The first and last System 2 board must have a 120ohm resistor installed across Terminals

#14 & #15. Failure to install these resistors will result in erratic operation of the entire System.

Refer to Figure 34.

Network Setup

Upon power-up, the “Master” unit must allocate space in its memory for user codes on all additional slaves.

This initial configuration need only be done once. If the first unit does not have slaves at the time of

installation, but may in the future, it should be set up as a master to allow networking. If the master is not set

up for networking at the time of installation, and needs to be later, the unit will need to be re-configured and

memory will be cleared.

Once each unit is properly configured for networking at power-up, the “Network Options” Option #18 is used

to configure each unit a slave or master. Slaves then need to have a slave number assigned to them which

allows the master to keep track of which slave it is polling. The master is then configured to poll for each

slave on the system. Slaves receive data from the master at the time it is programmed provided the slave is

on-line and being polled by the master. Slaves can also be “reloaded” at any time. This feature is necessary

when a slave is added to an existing installation.

Note: All units must have the identical options installed for the network to function. Example: If

the master has the 3,000 user option installed, each slave must have this same option

installed for proper operation. When a slave is polled that does not have the same

options, an “Invalid Config” message will be generated and the master will stop polling

the slave.

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 335 336

Brak uwag

Myalarm V-LCD1 Instrukcja Obsługi Strona 66