Weidmuller IE-GPRS-I/O - Manual (Page 8)

Serial Interface
DIP Switch - front side
Interface assignment
COM 1
1 DCD Received Line Signal Data Carrier Detect
2 RxD Received Data
3 TxD Transmitted Data
RS 232 4 DTR Data Terminal Ready
5 GND Signal Ground/Common Return
6 DSR Data Set Ready
7 RTS Request to Send
8 CTS Clear to Send
9 RING Ring Indicator
off off off off
1 2 3 4
ON
off off off
ON
off off off
ON
off off off
ON ON
off off
D DIIP P s sw wiittc ch h F Fu un nc cttiio on n
Operates as signalling and GSM/GPRS system
On-site configuration. Serial interface to the PC by
means of the programming cable
Diagnostics to the serial interface by means of a ter-
minal programme
Reset all default settings by applying the operating
voltage
Firmware update
1 2 3 4
S1
OFF
ON