User's Manual

SATELLINE-M3-TR1
User Guide, Version 3.0
14
o DTE is an abbreviation for Data Terminal Equipment
o DIR column below denotes the direction of the signal:
"IN" is from DTE to the radio modem, "OUT" is from the radio modem to the DTE.
Port 1 complies always with the RS-232 standard.
Port 2 can comply either with the RS-232, LVTTL, TTL or RS-422 standards. The interface type is
set at the factory according to the customer order. The user can set the ports ON/OFF
afterwards in the programming mode.
NOTE! Unused pins can be left unconnected.
*) RTS and CTS handshaking connections remain the same irrespective of the port used (Port 1
or Port 2).
**) A and B designators are opposite in Profibus standard.
3.2 Description of the D-15 connector
o DTR. Data Terminal Ready.
When open or connected to + Voltage the unit is ready for normal transfer mode.
When connected to Ground the unit goes to low current consumption mode.
OFF = <=0V, ON =>= 3V-30V.
o CTS. Clear To Send
o RD. Receive data
Asynchronous serial data.
o TD. Transmit data
Asynchronous serial data.
o RTS. Request to Send
o CTS. Clear To Send
o GND. Ground
Both the negative pole of the operating voltage and the signal ground.
o MODE
Programming pin. When floating or connected to +VDC the unit is in normal mode. When
connected to Ground the unit is in programming mode.
NOTE!
When the MODE-Pin (Pin 12 of the D-Connector) is connected to Ground, the modem is
in the Programming Mode and
Port 1
(PINS 6, 9, 11,13) will be in use! If you normally
use
Port 2
for data transmission, the serial cable must be changed to a suitable type when
switching over to the configuration mode.