|21 | Controller (SSR)+Alarm 1 (Relay)|
Display color and power (third digit)
|Encoding | Configuration|
|0 | Green display screen/100-240V AC power supply|
|1 | Red display screen/100-240V AC power supply|
|2 | Green display screen/12-30V DC/24V AC power supply|
|3 | Red display screen/12-30V DC/24V AC power supply|
Option (fourth place)
|Encoding | Options|
|0 | No additional options available|
|1 | Install a second alarm relay output|
|2 | Install RS485 communication function|
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