© Microhard Systems Inc.
36
RS485/422
TxB -
TxA -
RxB -
RxA -
GND -
Vin+ -
S2
3.0 Hardware Description
Drawing 3-28:
Nano Motherboard Rear View
The
DATA (RS232 Port (DCE))
on the rear
of the circuit board is used for:
•
RS232 serial data (300-230,400bps) when
in
DATA MODE
, or
•
for configuring the modem when in
COMMAND MODE
.
The
RS422/485 Port
is used to interface the Nano
Development Board to a DTE with the same
interface type. Either the RS232 or RS422/485
interface is used for data traffic.
Vin+/Vin–
is used to power the unit. The input
Voltage range is 9-30 Vdc.
3.5.3 Connectors and Indicators
3.5.3.2 Rear
On the back of the Development Board is the Data port, RS485/422 interface, as well as the
power connections.
Name
Data Port
Input or
Output
DCD
1
O
RXD
2
O
TXD
3
I
DTR
4
I
SG
5
DSR
6
O
RTS
7
I
CTS
8
O
RING
9
O
Table 3-10: Data RS232 Pin Assignment
Drawing 3-29:
Nano Enclosed Rear View
Caution:
Using a power
supply that does not
provide proper voltage
may damage the modem
.
RS485/422
TxB -
TxA -
RxB -
RxA -
GND -
Vin+ -
Green Conn.
Pin No.
Name
Input or
Output
6
TxB (D+)
O
5
TxA (D-)
O
4
RxB (R+)
I
3
RxA (R-)
I
2
Vin -
1
Vin +
I
Table 3-10: Data RS422/485 / Vin Pin Assignment
