13 com2 rs-232/rs-485 select (p2,p3), 14 rs-485 terminator select (jp2), 15 rs-485 header (jp3) – Acrosser AR-B1520 User Manual

Page 12: 16 sdram socket 144 pin (sodimm), 17 compact flash connector (cf), 18 pc104 plus connector (pci), 19 compact flash connector select (jp4)

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AR-B1520 User’s Guide

3.13 COM2 RS-232/RS-485 SELECT (P2,P3)

3.14 RS-485 TERMINATOR SELECT (JP2)

When there is only one line the setting should be left off, if multiple blocks are used on a single line. This should be
set to “ON” in order to properly terminate the connection for better transmission of data

Open

Factory Preset

1
2

Closed

3.15 RS-485 HEADER (JP3)

1 2 3

1 N485+
2 N485-
3 GND

3.16 SDRAM SOCKET 144 PIN (SODIMM)
3.17 COMPACT FLASH CONNECTOR (CF)
3.18 PC104 PLUS CONNECTOR (PCI)
3.19 COMPACT FLASH CONNECTOR SELECT (JP4)

1 2

JP4 (ON)

JUMPER

FUNCTION

5 3 1

RS-485

5 3 1

RS-232

FACTORY PRESET

PIN

FUNCTION

1-2 ON

MASTER

1-2 OFF

SLAVE

(Factory Preset)