Rockwell Automation 2755 AdaptaScan Software - Manual (Page 120)

8–11
Publication 2755-838
The DH-485 dialog configures parameters of DH485 protocol. Open
this dialog by selecting DH485 protocol on the Serial Port dialog and
then selecting the Edit button.
Node
Specifies a unique node address of the Reader on the DH485
network. If you are communicating point-to point, you must still
provide a node address different than the host device. The DH-485
node address may be different than the DeviceNet address assigned
for downloading configurations.
Important: When configuring an SLC DH-485 network with
AdaptaScan Readers, the nodes must be in sequential order. The
SLC must be node 1 and the Readers must follow (node 2, node 3,
...) Do not allow gaps between node addresses.
Maximum Node (Master Mode only)
Specifies the highest node number used by a device on the DH485
network. A low maximum node number improves network
performance since nodes above the maximum node are not scanned.
Master/Slave
Specifies whether the Reader is operating as a master or slave device
on the DH485 network. The default is slave. As a slave, the Reader
cannot initiate messages but only respond to requests from a host.
Master mode is only for communications with an SLC.
PCCC Enabled
Enables or disables the PCCC application layer. You must enable
PCCC when you are communicating with an SLC 500 (master or
slave) using DH485 protocol.
Configuring DH485
Communications