Meinberg HSC509 - Manual (Page 10)

10
Relay Outputs
The HSC509 provides four relay outputs that can be applied to switching times or cyclic
pulses. Eight different plans assigned to the weekdays, sundays or holidays can be edited
by the 4 keys in the frontpanel. A plan consists of up to 64 switch-on times and 64
switch-off times. Only one plan per day can be executed.
Alternative to the switching times cyclic pulses with a settable pulse length can be
programmed. A table of possible pulses and pulse lengths is given in chapter "Cyclic
Pulses". The maximum load to be applied to the relays is 50W.
Serial Interfaces
Two independent asynchronous serial ports can be used to transmit information on
date and time to other devices. Both interfaces can be configured either as a RS232
port or as a current loop port. Baudrate, framing and mode of operation can be
configured separately for COM0 and COM1. Additionally, a time zone can be assi-
gned to each port: The drivers can be configured individually to transmit either
standard time (MEZ/MESZ=CET/CEST), standard time with suppression of daylight
saving (always MEZ=CET), or UTC. Both serial ports can send a time string once per
second, per minute or only on request The format of the time string is described in the
section "Technical Specifications".
Outputs
Both the RS232 and the current loop output of one interface (e.g. COM0) provides the
same time string and can be connected simultaneously.
When using the port in the 20mA current loop mode the additional supply voltage
of -15V is not essential either when using only the passive outputs or a lower
interference immunity is tolerated. In the second case the negative output lines have to
be connected to GND.
Inputs
Only when using the output mode "on request" the RS232 input or the 20mA current
loop input has to be connected. It is not possible to connect both inputs.
The 20mA current loop input can be driven passive or active (see "Connector Pin
Assignment"). It is possible to drive the active input without the -15V supply voltage
by connecting the "OUT-" pin to GND.