Specifications

45
Schneider Electric
20 mA CL – RS232 – RS422 –
RS485 links (continued)
Standard cabling
Nul-modem cable
Nul-terminal cable
E52329E52330E52331
1
2
3
4
5
6
7
8
20
22
DTE
DIRECT DB25-DB25
DCE
1
2
3
4
5
6
7
8
20
22
Protective ground
Transmitted data
Received data
RTS
CTS
DSR
Signal ground
DCD (RLSD)
DTR
RI
1
2
3
4
5
6
7
8
20
22
DTE
NUL-MODEM
(asynchronous)
DTE
1
2
3
4
5
6
7
8
20
22
Protective ground
Transmitted data
Received data
RTS
CTS
DSR
Signal ground
DCD (RLSD)
DTR
RI
GRND
Transmitted data
Received data
RTS
CTS
DSR
Signal ground
DCD (RLSD)
DTR
RI
GRND
1
2
3
4
5
6
7
8
20
22
DCE
NUL-TERMINAL
(asynchronous)
DCE
1
2
3
4
5
6
7
8
20
22
Protective ground
Transmitted data
Received data
RTS
CTS
DSR
Signal ground
DCD (RLSD)
DTR
RI
GRND
Transmitted data
Received data
RTS
CTS
DSR
Signal ground
DCD (RLSD)
DTR
RI
GRND
Guide to Integration
Modbus / Jbus