Generex CS141 - Page 45

Version: 2020-09-04
45
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To insert an appropriate cable, pull back the spring mechanism - the clamp will automatically lock the cable at the desired position.
The Modbus Terminator-PIN
Another difference with the CS141 Professional: The CS141
Modbus adapter is capable to drive a real RS485 Modbus protocol
- not only Modbus over IP. In case of operating within a real
Modbus environment, you can easily integrate the CS141 Modbus
adapter.
Since Modbus expects termination resistors on both the first and
last devices in the bus network, the CS141 Modbus offers an
optional 120-ohm resistor that can be enabled by setting a PINS.
As a default, this PIN is set to OFF - the CS141 is configured not
to be the last device within the Modbus network. If required, this
pin can be set manually.
Note:
In general, the CS141 MODBUS will query the UPS via SNMP and provide appropriate MODBUS addresses and values. Due to this
fact, the UPS can be queried via MODBUS. Technically, the UPS is not connected to the Modbus network natively. However, the
Modbus controller will not be able to recognize this fact.
Modbus über RS485, RS232 und Modbus over IP
As mentioned, all devices of the CS141 family can master MODBUS queries - the difference is in the details: While the CS141 Modbus
version comes with an RS485 interface for native integration into a modbus infrastructure, the CS141 professional version uses a point-
to-point connection via RS232 and provides the information via Modbus over IP:
Since Modbus via RS232 is usually used when you want to transfer Modbus data from the UPS to another system or special monitoring
software, No terminating resistors are necessary for this connection type.
Due to this fact, the hardware layout of the boards changes if compared:
CS141 Modbus CS141 Professional
If compared to each other, the CS141 Modbus can be easilly distinguished from the CS141 Professional.
Since the external interface and the query via LAN can interfere with each other caused by differences in query timing, the parallel use
of Modbus over IP and via internal interfaces is not possible - you need to choose between the query options. With these operating
conditions Modbus over IP is available:
1. The external Modbus interface has been explicitly deactivated on the CS141-SCM / LM - since this interface is an exclusive
BUS interface, it is therefore a dedicated menu: