6 Functional description of receiver
COM x
Enabling of outputs
By default the pulse outputs and the the serial outputs are disabled after power up until the receiver is
synchronized. However, the monitor software can be used to configure each group of outputs so that they are
always enabled immediately after power-up.
Please refer to the chapter
for the specifications of the COM0 interface or to
the chapter
Pre-setting - standard and multiref port
for the pin assignment.
6.2.1 Optocoupler input
Pulse width modulated (DC Level Shift) time codes are isolated by an integrated optocoupler and supplied to
the TCR180PEX-EL. The connection diagram is as follows:
R = 220 Ohm
DIP 3
DIP 2
+ DCLS in
- DCLS in
MultiRef-Port: Pin Assignment of the D-SUB 9 connecor (see chapter
Pre-setting - standard and multiref
The internal series resistance allows direct connection of input signals with a maximum high level of +12
V (TTL or RS-422 for example). If signals with a higher amplitude are used, an additional external series
resistance has to be applied to not exceed the limit of the forward current of the input diode (60 mA). The
forward current should not be limited to a value of less than 10 mA to ensure safe switching of the optocoupler.
6.2.2 Pulse outputs
PO0:
Pulse each second (PPS), active HIGH, pulse duration 200 msec
PO1:
Pulse each minute (PPM), active HIGH, pulse duration 200 msec
6.2.3 Asynchronous serial port
The TCR180PEX-EL has two serial interfaces COM0 (standard port) and COM1 (multi ref. port). At delivery the
(COM0) is provided on the slot bracket. The interface (COM1) can optionally be used via a second D-SUB-9
connector.
By default, both interfaces remain inactive after the system is switched on, until the receiver is synchro-
nized. By using the monitor program, however, the TCR180PEX-EL can be configured so that the interfaces are
activated immediately after switch-on.
Transmission speed, framing and mode of operation can be configured individually for each port. Both of
the ports can be configured to transmit either time strings (once per second, once per minute, or on request with
TCR180PEX-EL
Date: 6th May 2021
17
