Rs-422 Network - Automationdirect.com DirectLOGIC DL205 Series User Manual

RS–422 Network
RS–422 signals are for long distances (1000 meters max.). Use termination resistors at both
ends of RS–422 network wiring, matching the impedance rating of the cable (between 100
and 500 ohms).
NOTE: For RS–422 cabling, we recommend AutomationDirect L19853 (Belden 8103) or equivalent.
RXD+
RXD–
ASCII
TXD+
Slave
TXD–
Device
Signal GND
RS–232 Network
RS–232 signals are used for shorter distances (15 meters max.) and limited to
communications between two devices.
NOTE: For RS–232 cabling, we recommend AutomationDirect L19772 (Belden 8102) or equivalent.
Signal GND
GND
RXD
TXD
CTS
RTS
ASCII Slave
ASCII Device
Device
Chapter 4: System Design and Configuration
6
1
11
7
2
TXD
3
RXD
4
RTS
5
CTS
10 15
CPU Port 2
CPU Port 2
Master
DL205 User Manual, 4th Edition, Rev. B
9 TXD+
10 TXD–
13 RXD+
6 RXD–
11 RTS+
12 RTS–
14 CTS+
15 CTS–
7 0V
Port 2 Pin Descriptions (DL250-1)
1
5V 5 VDC
2
TXD2 Transmit Data (RS-232)
3
RXD2 Receive Data (RS-232)
4
RTS2 Ready to Send (RS–232)
5
CTS2 Clear to Send (RS–232)
6
RXD2– Receive Data – (RS–422)
7
0V Logic Ground
8
0V Logic Ground
9
TXD2+ Transmit Data + (RS–422)
10
TXD2 – Transmit Data – (RS–422)
11
RTS2 + Request to Send + (RS–422)
12
RTS2 – Request to Send – (RS–422)
13
RXD2 + Receive Data + (RS–422 )
14
CTS2 + Clear to Send + (RS422)
15
CTS2 – Clear to Send – (RS–422)
1
2
3
4
5
6
Termination
Resistor at
both ends of
network
7
PORT 2
8
Master
9
10
11
12
13
14
A
B
C
D
4–57