Specifications

AR-B1564 User¡¦s Guide
3-4
(E) RS-485 Mode Select (SW2-2 & SW2-3)
Figure 3-6 SW2-2 & SW2-3: RS-485 Mode Select
When RS-422 or RS-485 mode is selected, you also need to change JP4 to select between RS-422 or RS-485
mode.
NOTE: 1. The recommended configuration for RS-485 interface is to set the transmitter to the controlled by DTR
and set the transmitter. Receiver is disabled.
2. The receiver is always enabled, so you will receive data that you transmitted previously. It is not
recommended to use this setting as RS-485 interface.
(2) TTL I/O Connector (CN15)
Figure 3-7 CN15: TTL Connector
CN15 Signal CN15 Signal
1 TTLOP0 2 TTLIP0
3 TTLOP1 4 TTLIP1
5 TTLOP2 6 TTLIP2
7 TTLOP3 8 TTLIP3
9 GROUND 10 VCC
Table 3-7 TTL Pin Assignment