Quatech Connector Pinout: DB-37F connector: RS-422/485
See Product Sheet for Optional Cables

Signal

Port 1

Port 2

Port 3

Port 4

TxD+

Pin 24

Pin 10

Pin 33

Pin 19

TxD-

Pin 5

Pin 28

Pin 14

Pin 37

RxD+

Pin 23

Pin 9

Pin 32

Pin 18

RxD-

Pin 4

Pin 27

Pin 13

Pin 36

AuxOut+

Pin 21

Pin 7

Pin 30

Pin 16

AuxOut-

Pin 22

Pin 8

Pin 31

Pin 17

AuxIn+

Pin 20

Pin 6

Pin 29

Pin 15

AuxIn-

Pin 2

Pin 25

Pin 11

Pin 34

Ground

Pin 3

Pin 26

Pin 12

Pin 35