Chapter 9 Expansion Module 228
Connect with electrical source
Input 24VDC
1
+
-
24V
2
①-1A quick-blowing fuse, circuit-breaker or circuit protector.
②-Surge absorber.
Communication set
The MBUS communication baud rate and format can be set by 8 switches (DIP), SW1.
Baud rate
SW1-1~SW1-3 set communication baud rate is 4.8K, 9.6K, 19.2K, 38.4K, 57.6K as shown below.
SW1-1 SW1-2 SW1-3 SW1-6 Baud rate (Kbps)
OFF OFF OFF OFF 4.8
ON OFF OFF OFF 9.6
OFF ON OFF OFF 19.2
ON ON OFF OFF 38.4
* * ON OFF 57.6
* * * ON 38.4
※ * can be ON or OFF
Parity bit and stop bit
SW1-4~SW1-5, set stop bit and verifying bit
SW1-6, assembled setting
SW1-7~SW1-8, reserved
More information as shown below:
SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 Stop bit, parity bit, assembled set
OFF OFF OFF * * 2 stop bits, no parity bit
OFF ON OFF * * 1 stop bit, no parity bit
ON OFF OFF * * 1 stop bit, 1 odd parity bit
ON ON OFF * * 1 stop bit, 1 even parity bit
* * ON * *
SW1-1~SW1-5 are inefficiency,
communication format is default as
38.4Kbps, 2 stop bits, no parity bit
※ * can be ON or OFF
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