Seneca Z-PASS1, Руководство пользователя

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USER MANUAL – Z-PASS1/Z-PASS2
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12 Modbus Gateway
Z-PASS can be configured to run as a Modbus Gateway: in this modality, a set of configured tags are
periodically and continuously read from Modbus RTU devices and these values are always available in a
shared memory, queryable via Modbus TCP.
Z-PASS Modbus Gateway supports up to 2000 tags and up to 32 Modbus TCP Client contemporaneously.
In the Z-PASS Modbus Gateway, a Modbus TCP/IP Server (or slave) is always running on a configured TCP
port.
As for Modbus Bridge functionality (see chapter 10), the Modbus TCP requests can be forwarded through
the Ethernet interface (LAN) or through the Mobile/VPN interface (WAN).
Then, for each of the three available serial ports (COM1, COM2, COM4), can be defined the “Task”: a serial
port can be Configured as a Modbus RTU Master or Modbus RTU Slave or not running at all.
In this manner, a number of possible combinations are available, to a maximum of three Modbus RTU
Masters or three Modbus RTU Slaves; normally, a combination of the two will be chosen, for example:
Modbus RTU Slave on COM1 and Modbus RTU Masters on COM2,COM4.
In the following pictures are shown, some typical scenarios.
In the above picture, two serial ports (RS232 – COM1, RS485 – COM2) are configured as Modbus RTU
Master.