User`s manual

User’s Manual
Arctic GPRS Gateway 11 Viola Systems Ltd.
Serial Ports (RS-232, RS-422/485 -connectors)
Arctic has two serial port connectors. These are 9-pin male connectors (DB9). A null modem cable
may be used to connect the Arctic to a serial device or a PC. The Arctic supports CTS/RTS flow
control. The figure of Arctic’s DB9 (DTE) Male connector is shown below:
1
5
6
9
The serial port 1 (RS1) is a full RS-232 -port. The pin description of this port is as follows:
Pin
Number
Name Direction Explanation
1 DCD IN Data Carrier Detect
2 RXD IN Received Data
3 TXD OUT Transmitted Data
4 DTR OUT Data Terminal Ready. Handshake output
5 GND - Signal ground.
6 DSR IN Data Set Ready. Handshake input
7 RTS OUT Ready To Send. Handshake output
8 CTS IN Clear To Send. Handshake input
9 RI IN Ring Indicator
The serial port 2 (RS2) can be configured either as a half RS-232 or an RS-422/485 (DTE Master).
Pin description is same as in RS1, when in RS-232 mode. The pin description of this port is as follows
in RS-485 mode.
Pin
Number
RS-485,Full
duplex (4-wire)
RS-485 Half duplex
(2-wire)
1 NC NC
2
RXD
+ (in)
NC
3
TXD
–(out)
TXD/RXD- (out/in)
4 NC NC
5 GND GND
6 NC NC
7 TXD+ (out) TXD/RXD+ (out/in)
8 RXD–(in) NC
9 NC NC
Note: Make sure that you DO NOT connect RS-422 or RS-485 devices to a port which has been
configured to operate as an RS-232 port.