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5.9 Function of RC3000-SUB-D232
RC3000-SUB-D232 serial data sub-card has standard RS232 interface. There are 8 channels which is
decided by hardware, unchangeable. Four RJ45 connectors make up of the 8 channels and each RJ45
connector has two channels. And the definition of each interface is as follows:
1 2 3 4 5 6 7 8
Channel
Pins
Channel
Pins
Note: 2RX is the input of RS232 Rx data, 3TX is the output of Tx data and 1, 4GND are the ground.
Here we want to explain the grounding rules: there are two grounding conductors, one is signal
grounding and the other one is chassis grounding connects to DB9 or DB15. Please connect the RJ45
connector of RS232 first and then DB interface of other device when connect RS232 with other
device (both powered on), this can make sure of grounding protection to avoid destroy of RS232
serial interface.
5.9.1 Interface reference of RS232
Interface definition of general connector.
a.
1: Carrier Detect (DCD),
4: Data Terminal Ready (DTR),
7: Request Transmitting (RTS),
b.
1: Not using,
4: Request Transmitting (RTS),
7: Signal Ground (SG),
20: Data Terminal Ready (DTR),
23-25: Not using.
Definition of DB9 and DB25 as well as dealing with connection of RC3000-SUB-D232 sub-card:
DB9
1 2 3 4 5 6 7 8
RJ45-1
1
RJ45-1
2RX,3TX,1,4GND
6RX,7TX,5,8GND
5
RJ45-3
2RX,3TX,1,4GND
6RX,7TX,5,8GND
DB9 definition:
DB25 definition:
2
3
1 2 3 4 5 6 7 8
RJ45-2
Figure 5-14
2
RJ45-1
2RX,3TX,1,4GND
6
RJ45-3
2RX,3TX,1,4GND
2: Receive Data (RXD),
5: Signal Ground (SG),
8: Clear Transmitting (CTS),
2: Transmitting Data (TXD),
5: Clear Transmitting (CTS),
8: Carrier Detect (DCD),
21: Not using,
5
1, 4, 6
1 2 3 4 5 6 7 8
RJ45-3
3
RJ45-2
RJ45-2
6RX,7TX,5,8GND
7
RJ45-4
RJ45-4
6RX,7TX,5,8GND
3: Transmitting Data (TXD),
6: Data Ready (DSR),
9: Ring Indication (RI).
3: Receiving Data (RXD),
6: Data Ready (DSR),
9-19: Not using,
22: Ring Indication (RI),
7, 8
User Manual
RJ45-4
4
8
31
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