DekTec DTM-3200 IP-ASI Converter - Manual (Page 16)

DTM-3200 – OEM Ethernet TSoIP Converter
User Manual
16
Please note that it is not required to select between I 2 C and RS-XXX: The DTM-3200 will
automatically use the interface on which it detects activity.
DIP switches for RS-232/485/422
For RS-232 or RS-485/422, the DIP switches have the following meaning:
Switch # Description
1 Device address bit 0 – LSB (off = 0, on = 1)
2 Device address bit 1 – MSB (off = 0, on = 1)
3 RS-232 or RS-485/422 (off = RS-232; on = RS-485/422)
4 Baud-rate (off = 9600; on = 115200)
The device address bits are used for RS-485/422 only. The device address is 0x40 + two LSBs as
selected by the DIP switches. This means that the device address range is between 0x40 and 0x43.
DIP switches for I 2 C
For I 2 C communication, the DIP switches have the following meaning:
Switch # Description
4, 3, 2, 1 Device address bit 3..0 (DIP switch off = 0, on = 1)
The I 2 C device address is 0x40 + four LSBs as selected by the DIP switches. This means that the I 2 C
device address range is between 0x40 and 0x4F.
3.4.5 Control connector
The pinning of the control connector is shown in the table below. It’s a single row pin header for
connecting the RS-232 (DCE), RS-485/422 or I 2 C control bus. The exact function of the signals
depends on whether RS-232 or RS-485/422 mode is selected by the DIP switches.
Pin RS-232 mode (DCE) RS-485/422 mode
1 NC NC
2 NC NC
3 TX TX/RX-
4 CTS NC
5 RX NC
6 RTS TX/RX+
7 NC NC
8 NC NC
9 GND GND
10 NC NC
11 SDA SDA
12 SCL SCL
The pinning of this connector has been chosen in such a way that a 9-way flatcable with a press-fit
sub-D flatcable connector can be connected directly to pin 1 – 9, see the figure below.