ES-U-2016-RM EasySync, ES-U-2016-RM Datasheet - Page 16

• Manufacturer Part Number: ES-U-2016-RM
• Description: USB Interface IC USB to 16 Ports RS422/RS485, Metal
• Manufacturer: EasySync

Jumper Settings for RS-485
Note: all other positions = no jumper populated.
Jumper
(no echo)
13 – 14
15 – 16
11 - 12
19 - 20
(echo)
1 - 2
5 - 6
7 - 8
OR
Enable TxD / RxD Termination with 120 Ohm. This jumper should only be
populated if this ES-U-xxxx-x converter is at one end of the cable, to meet RS-
485 termination requirements.
TxD / RxD Single pair (half duplex for RS-485). Populate both these jumpers
for half-duplex RS-485.
Enable TxD Driver only when transmitting. This is required for RS-485 half-
duplex, as multiple devices can transmit over the same twisted pair. When an
RS-485 node is not transmitting, its transmitter must be turned off to allow
other devices to communicate over the same wire.
RxD Always Enabled. In this RS-485 mode, characters transmitted by the RS-
485 device will also be received by the same device. These echoed characters
are usually stripped out by the application software.
Transmit Data Echo Suppression Mode. In this mode, characters transmitted
by the RS-485 device will NOT be received by the same device. In this mode
there is no need for the application software to strip out the transmitted data
from the received data as it is handled by the hardware.
CTS Always Enabled. As there is no hardware handshaking in RS-485, CTS
should be permanently enabled to allow unrestricted flow of data. If
handshaking is required for RS-485 it can be done using X-On / X-Off
handshaking protocol.
Table 3
©2010 - 2011 EasySYNC Ltd.
RS-485 Mode Configuration
Function
Document Reference No.: ES_000061
USB to Serial Converters Manual
Clearance No.: ES
Version 1.2
# 35
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