Contec SPI-6941-LV - Page 24

CHAPTER 2 –Ha r dwa r e I n s tallatio n s
SPI-6941-LV 19
Pi n a ss ig n m e n t a ft er co n ver s io n b y a tt ac h e d ca b le ( D B - 9 co nn ec t or ) ( N o.4 -
40 UNC )
Pin No.
1
2
3
4
5
6
7
8
9
R S - 232 C
D C D
R X D
T X D
DT R
GND
DS R
R TS
C TS
R I
R S - 422
T X -
T X +
R X +
R X -
GND
R TS -
R TS+
C TS+
C TS -
R S - 485
T X -
T X +
R X +
R X -
GND
N. C .
N. C .
N. C .
N. C .
1 5
9
6
N ote :
 Fo r RS - 485, T X+ ( pin 2 ) and RX+ ( pin 3 ) m u s t ju m pe r togethe r in s ide the D type
connecto r .
 T X - ( pin 1 ) and RX - ( pin 4 ) i s the s a m e.
2 . 6 . 1 R S - 422 / R S - 485 s pe c i f i c a t i on s
 Transmission system: Asynchronous, half-/full-duplex serial transmission
conforming to RS-422/RS-485
 Baud rate: 19200 to 50bpx (programmable)
 Signal extensible distance: 1.2km Max.