Honeywell UDC2500 ユーザーズマニュアル

•  Whenever analog register addresses 0001 through 0074 (those that can be changed 

via communications) are changed, a Write cycle occurs after receipt of the message 
and the response is returned. 

•  Override analog register address 007D (computer setpoint) is not stored in non-

volatile memory. It can be changed as frequently as desired with no effect on non-
volatile memory retentivity, but the controller must remain in the slave mode. 

•  Whenever digital configuration register addresses 0080 through 00FA are updated via 

communications, the non-volatile memory is updated as soon as the message is 
received. 

•  Reads minimum 20mS and writes minimum 200mS 

•  IR port 20 and 21 

•  RS485 and Ethernet ports 1,2,3,4,6,16,17,20,21  

•  When the Shed Timer is enabled and a write or override occurs the controller will 

enter Slave Mode. The keypad is locked from the operator. The purpose of this mode 
is that if communications is lost and the shed timer times out then the controller will 
enter a known state of operation.  The configuration of the “Shed Mode and Output” 
and Shed Setpoint Recall are used to configure the controller’s shed state. While in 
Slave Mode pushing the MAN/AUTO key enters Emergency Manual mode. The 
local operator then has control of the output. The controller is in Monitor Mode if the 
Shed timer is disabled. 

The following control data can be read from this instrument: 

•  Input 1 

•  Input 2 

•  PV, SP, Output 

Use the identifying codes listed in Table 10-1 to read the specific items. 

A Write request for these codes will result in an Error message.