4 Position of Connectors and Functions of VPNRouter iR 5221 and VPNRouter iR 3220
4.9. Serial
VPNRouter iR 5221 and VPNRouter iR 3220 provide two DSub-9 male connectors. All three modes
of operating RS232, RS422 or RS485 are entirely congurable by software. For the pinout refer to
the Table
. If the conguration by software is not used, the default operation mode of each port
is congured by a DIP switch. The DIP switch may be overridden by software, if the user chooses
to do so. Check section ?? on page ?? for details.
Pin RS232
RS422
RS485 2-wire
1
DCD
Tx- (A)
Data- (A)
2
RxD
Tx+ (B)
Data+ (B)
3
TxD
Rx+ (B)
4
DTR
Rx- (A)
5
GND
GND
GND
6
DSR
7
RTS
8
CTS
9
RI
Table 8: Serial DSub-9 Pinout
Figure 14: COM
Ports
Please note the function of the GND signal in RS422 and RS485 modes: this signal must also be
connected between the serial devices. So in reality a 2-wire and a 4-wire connection need 3 wire
and 5 wire respectively. With the exception of very special congurations, a serial connection in
RS422/RS485 mode without GND connection violates the specications for RS422 and RS485
standards.
4.9.1. DIP Conguration for Serial Ports
The right side of the case has a small opening slit. This is provided to access
the DIP switches for serial conguration. With a small pen or screw driver
the conguration can be changed without opening the case.
The current setting of the switches is readable by software. If the user or
software decides to do this, the software can override the active conguration,
i.e. change the operation mode. Please check section ?? on page ?? for details
about this function.
Figure 15: DIP
Switches
4.10. SD-Slot
The VPNRouter provides an SD-Slot on the front side of the case, for cards
in standard size. The slot supports cards as SD 2.0 or SDHC type, to allow
up to 32 GB of capacity. Class 10 cards are supported as well.
If an operating system is installed on the SD Card, the VPNRouter will boot
this software.
Figure 16: SD and
SIM Slot
Juli 2016
VPNRouter Software Manual
20