Discharge Air Controller (DAC) Manual The MODBUS Network • 5
3.1.2. Network Addressing -
Visograph
The network address makes a board unique from
other boards on the network of the same type. This
allows the site controller to find it and communicate
with it easily.
The network address of the DAC is set using add-
on devices called visographs (P/N 318-7272).
3.1.2.1. Connecting the Visograph
The Visograph is connected with a 3-wire
connection on pins 103, 104, and 105.
3.1.2.2. Visograph Navigation
• Six menu items are available to choose from.
• Shows current MODBUS address and
application version (see Figure 3-4).
• Press corresponding button along the bottom
(T1-T6) to navigate to desired item.
3.1.2.3. Setting the MODBUS Address
Boards of the same type are typically numbered in
sequence, starting with one and continuing with two,
three, and so forth.
1. Press 5 - Controller Info on the main menu
to see Controller Info screen.
The first field highlighted by the cursor is the
Modbus Address. To change the address:
2. Press the ENTER key (T3). The address field
Figure 3-2 - Network ID Settings
CAUTION! The DAC may be damaged if the
wires are crossed when connecting the
visograph, especially if pin 103 (Vnr) is
accidentally connected to + or –
Figure 3-3 - Visograph Buttons
Figure 3-4 - Main Menu - Press 5 to Set Address
Figure 3-5 - Controller Info - Modbus Address
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