GE CC-SCSTAT User Manual download pdf (Page 33)

Serial communication

Serial communication includes:

• RS485 com port

• RS485 address

• RS485 protocol

• Thermostat network commands

RS485 com port

The thermostat has a RS485 serial com port. This is a two-wire (plus ground), half-duplex communication

network. Typically, the thermostat will be used on the SmartCommand network and connected to the Smart

Command automation controller.

The RS485 com port communication setup is 9600 baud, 8 data bits, 1 stop bit, and no parity. Flow control is

set to None.

Transmission delay

The thermostat will delay responses to request messages for 5 msec to conform to the SmartCommand network

protocol. This is necessary for RS485 half-duplex devices to use send data control for automatic flow control.

RS485 address

You can check the network address setting of the thermostat by pressing Menu to open the main Menu screen.

Scroll down to the Thermostat info menu item and press Select. The Thermostat information screen on page 16

will show the current network address of the thermostat. The default network address is 1.

Changing the network address

The network address is set from the Installer settings screen on page 17 on the WDU. This is a hidden menu

and does not appear in the main Menu screen selections. To change the network address, do the following:

1. Press Menu to open the Main menu screen on page 7.

2. While in the Menu screen, press and hold the middle two control buttons on the WDU for five seconds

until the Installer settings screen on page 17 opens.

3. Scroll down to the Network menu item in the Installer settings screen and press Select. You can set the

network address from 1 to 254.

Note: Network address 0 is reserved for the host system address and 255 is reserved for global commands.

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GE CC-SCSTAT User Manual Page 33