c.
Gateway Mode
is an advanced application mode and it is used to convert
the Modbus protocol. But there is only RS-232 and RS-485 interface
supported in the ZT-255x device, so the data is always regarded as
Modbus RTU format.
Module
Frame Type Note
Broadcast
(Default)
Data is sent to all of ZigBee slaves
ZT-2550
Unicast
(Advanced)
Data will be sent to a specific ZigBee slave.
The Address of DCON/Modbus command is regarded as
destination ZigBee address
ZT-2551 Unicast
Data only be sent to coordinator
[Eg1]
When ZT-2550/ZT-2570 receives data “MRTU_CMD_01” from serial
port,
→ZT-2551 will output the data “MRTU_CMD_01” to serial port directly.
[Eg2]
When ZT-2570 receives data “MTCP_CMD_02” from Ethernet,
→ZT-2551 will convert protocol then output “MRTU_CMD_01” to serial port.
[Eg3]
When ZT-2551 transmits the acknowledgement “MRTU_ACK_03”,
→ZT-2550/ZT-2570 will response the acknowledgement “MRTU_ACK_03” to
serial port directly.
→ZT-2570 will convert protocol then output “MTCP_CMD_01” to Ethernet.
(
Note: Unicast type frame, data will only be sent to the ZigBee host
)
※
There is an “Advanced Settings” to the Gateway Mode for some specific users,
please refer the user manual section 7.2 “DCON/Modbus Device Communication” for
more information.
ZC_0000
ZS_0001
MODBUS RTU
MODBUS RTU
Serial
Ethernet
MODBUS
TCP
Serial
Ethernet
MODBUS TCP
ICP
DAS,
ZT
‐
2550/ZT
‐
2551
Quick
Start
Guide,
Version
1.2
Page
8
