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![](https://files.manualsfile.com/91658739-vth8641kms-wp/bg17.png)
Table 1-9 Rear panel description
No. Port
1 Alarm port
2 RS-485 and power output port
3
●
5421H: Power input port
●
5422H: 2-wire port
4 Network port
Figure 1-19 RS-485 port
16
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