Yokogawa SM21-AG4

The YHC 4150X HART Communicator is a full function HART Communicator supporting Universal, 

Common Practice and Device Specific commands for commissioning, configuration and maintenance 

operations. HART field devices can be configured, polled, and trimmed using the YHC with HART 

communications.

heart symbol indicates active HART 

 communication u

 up arrow indicates SHIFT key ( ) is on 

# number sign indicates numeric / symbol entry 

 is the active entry mode for all dual functions 

 keys 

A the letter “A” indicates alpha entry is the active 

 entry mode for all dual function keys 

 battery symbol indicates YHC under battery 

power; filled portion indicates remaining 

battery 

 electrical plug symbol indicates the AC adapter 

 is connected and powering the YHC 

BUSY text box replaces either power symbol 

when the microprocessor is busy executing a 

previously requested task. Do not press keys 

when this status symbol is displayed.

The YHC keypad has three basic key types: single 

function keys, dual-function keys, and soft keys 

with changing definitions. 

Single function keys control a dedicated YHC 

function. 

Dual function keys, through the use of the Alpha 

Lock ( ) or Shift ( ) keys, toggle between 

two separate functions as needed to facilitate data 

entry. 

Soft key functions change depending on the 

operating mode. Soft key definitions are 

displayed at the bottom of the LCD, just above 

their respective gray soft keys. 

The left hand thumb keys can be used to scroll 

up, scroll down, and to select menu items.

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

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