Vecow EIC-1000 User Manual page 20

2.2.8 Serial Port (J12, J13)
COM1 and COM2 can be configured for RS-232, RS-422, or RS-485. The
default definition of COM 1 and COM 2 is RS-232. To change to RS-422 or RS-
485, please refer to Section 4.4.
For RS-232, the data rate is 1.5Mbps with maximum load of 150pF. For RS-422/
RS-485, the data rate is 10Mbps with maximum load of 47pF.
The operation modes can be selected by software configuration :
Mode
0 RS-422 Full Duplex
1 Pure RS-232
2 RS-485 Half Duplex
3 RS-485 Half Duplex
4 RS-422 Full Duplex
5 Reserved
6 RS-485 Half Duplex
7 Low Power Shutdown
The pin assignments are listed in the following table :
Serial Port
1 to 2
©Vecow EIC-1000 User Manual
Description
1T/1R RS-422
3T/5R RS-232.
1T/1R RS-485, TX ENABLE Low Active
1T/1R RS-485, TX ENABLE High Active
1T/1R RS-422 with termination resistor (120 ohm)
and bias Resistor (1K ohm)
Reserved
1T/1R RS-485 with termination resistor and bias
resistor. TX ENABLE Low Active
All I/O pins are High Impedance
Pin No. RS-232
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Status
RS-422
TXD-
TXD+
RXD+
RXD-
GND
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GETTING TO KNOW YOUR EIC-1000
RS-485
DATA-
DATA+
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GND
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