Serial Port Pin Assignments

The DS1101 and DS1102 are identical to each other, with one exception: The DS1101 has the RS232 port, while the DS1102 has a universal RS232/422/485 port.

Pin assignments below list additional TX and RX lines (for example, TX2 and RX2) next to "traditional" functions such as RTS and CTS. This is because the serial ports of DS1101 and DS1102 devices offer multiple serial channels.

Serial Port of the DS1101

ds1101_db9m

#1

RX4 (input, commonly DCD)

#2

RX (input)

#3

TX (output)

#4

TX3 (output, commonly DTR)

#5

Ground

#6

RX3 (input, commonly DSR)

#7

TX2 (output, commonly RTS)

#8

RX2 (input, commonly CTS)

#9

Power input/output ("12VDC")*

  • An attached serial device can be powered through this pin — there is an internal relay that can pass the power received into the power jack to pin 9 of the serial port. The Power on Pin 9 setting enables or disables this power output. Alternatively, the DS1101 can itself be powered through this pin if the attached serial device provides such power on pin 9.

Serial Port of the DS1102

ds1102_db9m

 

RS232

RS422

RS485

#1

<No connection>

TX2- (output, commonly RTS-)

<No connection>

#2

RX (input)

RX- (input)

RX- (input)

#3

TX (output)

TX+ (output)

TX+ (output)

#4

TX3 (output, commonly DTR)

TX- (output)

TX- (output)

#5

Ground

Ground

Ground

#6

RX3 (input, commonly DSR)

RX+ (input)

RX+ (input)

#7

TX2 (output, commonly RTS)

TX2+ (output, commonly RTS+)

<No connection>

#8

RX2 (input, commonly CTS)

RX2+ (input, commonly CTS+)

<No connection>

#9

<No connection>

RX2- (input, commonly CTS-)

<No connection>