ES-U-2016-RM EasySync, ES-U-2016-RM Datasheet - Page 18

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

Jumper Settings
Inside the unit, there is a 7x3 (21 pin) header block. Jumpers are used to select features such as 120
Ohm termination on Tx, Rx and CTS, and 750 Ohm biasing resistors on Tx and Rx. You will need to open
up the cover and set the jumpers as per the requirements of your application.
Note: If biasing of an RS-485 half-duplex bus is required, enable Rx biasing only (Pull-up Rx+ to VCC by 750 Ohm
Bias resistor and Pull-down Rx- to GND by 750 Ohm Bias resistor). Tx biasing should not be used as this would provide
two sets of biasing resistors on the bus.
Jumper
11 – 12
13 – 14
14 – 15
16 – 17
17 – 18
19 – 20
10 - 11
20 - 21
2 – 3
4 – 5
5 – 6
7 – 8
8 – 9
1 - 2
Enable Tx+/- Termination with 120 Ohm. This jumper should be
populated for RS-485 half-Duplex mode
Disable Tx+/- Termination
Pull-up Tx+ to VCC by 750 Ohm Bias resistor. This jumper should be
populated to enable pull-up of Tx+
Disable Pull-up of Tx+ to VCC
Pull-down Tx- to GND by 750 Ohm Bias resistor This jumper should be
populated to enable pull-down of Tx-
Disable Pull-down of Tx- to GND
Enable Rx+/- Termination with 120 Ohm. This jumper should be
populated for RS-422 and RS-485 Full-Duplex mode
Disable Rx+/- Termination
Pull-up Rx+ to VCC by 750 Ohm Bias resistor. This jumper should be
populated to enable pull-up of Rx+
Disable Pull-up of Rx+ to VCC
Pull-down Rx- to GND by 750 Ohm Bias resistor. This jumper should be
populated to enable pull-down of Rx-
Disable Pull-down of Rx- to GND
Enable CTS Termination with 120 Ohm. This jumper should be populated
for RS-422 mode
Disable CTS Termination
Table 5
©2010 - 2011 EasySYNC Ltd.
Jumpers to select termination and biasing
Function
Document Reference No.: ES_000061
USB to Serial Converters Manual
Clearance No.: ES
Version 1.2
# 35
18