Specifications

AR-B1564 User¡¦s Guide
3-5
(3) TTL & RS-485/RS-422 Connector (CN14)
CN14 supports TTL, RS-422, RS-485 pinout of serial port 1 and port 2. The serial port 1 is set to be TTL mode; the
serial port 2 is set to be RS-422/RS-485 mode.
Use the enclosed TTL/RS-422/RS-485 adapter cable connecting the CN14, there is two DB-9 serial ports. COM A
is connected to the TTL, COM B is connected to the RS-422/RS-485. CN14 pin assignments are as follows:
Figure 3-8 CN14: TTL & RS-422/RS-485 Connector
Port CN14 DB-9 Signal CN14 DB-9 Signal
1 1 -DCD (TTL) 2 6 -DSR (TTL)
3 2 RXD (TTL) 4 7 -RTS (TTL)
5 3 TXD (TTL) 6 8 -CTS (TTL)
7 4 -DTR (TTL) 8 9 -RI (TTL)
Port 1
(COM A)
9 5 Ground 10 -- VCC
11 1 Ground 12 6 CTS+
13 2 RTS+ 14 7 CTS -
15 3 RTS - 16 8 RXD+
17 4 TXD+ 18 9 RXD -
Port 2
(COM B)
19 5 TXD- 20 -- GND
Table 3-1 TTL & RS-422/RS-485 Pin Assignment