SENA DirectPort-USB - Manual (Page 7)

DirectPort-USB
Page 7 of 36
4. DirectPort-USB UC1B (RS422/485) Settings
4.1 DB9 Male Connector
RS422  RS485 
4.2 JP1 Slew: RS422/RS485 Slew Rate Limit Function Settings
 Select ‘Slew Rate Limit function on’ to reduce electromagnetic waves. Maximum serial
communication speed is restricted to 250Kbps when this function is on.
 Slew Rate Limit allows communication without errors by activating slew-rate driver to reduce
reflection waves and EMI electromagnetic waves. However, communication speed is limited when it
is used.
4.3 JP2 RT: RS422/RS485 Terminal Resistor Settings
Off (Default) On
RS422 Terminal
Resistor
RS485 Terminal
Resistor
Unused
(Default)