- 6 -
Type 2: You can connect the RS-232 side of the A52/A53 to a DTE, such
as a terminal or PC COM1/2, with 3-pin wiring if you don’t need
hardware flow control.
A52/A53
RJ45
DTE Device
DB25 Male
DTE Device
DB9 Male
DCE Device
DB25 Female
TxD
5
3
2
2
RxD
RxD
6
2
3
3
TxD
GND
7
7
5
7
GND
RS-422/RS-485 Pinouts
The RS-422/RS-485 port with RJ45 connector or Terminal Block
Connector is depicted as follows.
RS-422
Pin RS-422 with RJ45
Pin RS-422 with Terminal Block
1 TxD – (A)
1 TxD + (B)
2 RTS – (A)
2 TxD – (A)
3 RTS + (B)
3 RxD + (B)
4/7 SG
4 RxD – (A)
5 TxD + (B)
5 SG
6 RxD + (B)
6 Power GND
8 CTS + (B)
7 VCCA (9V)
9 CTS – (A)
– –
10 RxD – (A)
– –
NOTE
Pins 6 and 7 of the Terminal Block are for Power GND and Power
Input, which can be used instead of a power adaptor. Be careful
NOT TO confuse RS-422/RS-485 GND with Power GND.
SG: Signal Ground
RS-485
Pin RS-485 with RJ45
Pin RS-485 with Terminal Block
1 Data – (A)
1 Data + (B)
4 SG
2 Data – (A)
5 Data + (B)
5 SG
7 SG
6 Power GND
– –
7 VCCA 9 V
– –
8 –
NOTE
Pins 6 and 7 of the Terminal Block are for Power GND and Power
Input, which can be used instead of a power adaptor. Be careful
NOT TO confuse RS-422/RS-485 GND with Power GND.
SG: Signal Ground
