Comparison of Modbus (MQTT) Gateways

ModelEM731PM230PM822PM830PMQ822PMQ830PM824PMD822PMD840
DescriptionModbusModbusModbusModbusModbus to MQTTModbus to MQTTModbus+IsolationModbus+DIOModbus+DI
OSRTOS LinuxuCLinuxOpenWrt LinuxOpenWrt LinuxOpenWrt LinuxOpenWrt LinuxOpenWrt LinuxOpenWrt LinuxOpenWrt Linux
CPUARM Cortex M4ARM 7MIPSMIPSMIPSMIPSMIPSMIPSMIPS
CPU-Speed120 MHz80 MHz580 MHz580 MHz580 MHz580 MHz580 MHz580 MHz580 MHz
SDRAM256 KB8 MB128 MB128 MB128 MB128 MB128 MB128 MB128 MB
Flash ROM1 MB4 MB32 MB32 MB32 MB32 MB32 MB32 MB32 MB
Ethernet111111111
WiFi 802.11 b/g/n1111111
Socket Connection188888888
RS232/RS422/RS4851224
RS23211111
RS422/RS48511111
Digital Input24
Digital Output2
Baud Rate300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K300 ~ 230.4 K
WatchdogVVVVVVVVV
Utility / Web Page SetupVVVVVVVVV
Power InputDC 9 ~ 30 VDC 9 ~ 24 VDC 9 ~ 32 VDC 9 ~ 32 VDC 9 ~ 32 VDC 9 ~ 32 VDC 9 ~ 32 VDC 9 ~ 32 VDC 9 ~ 32 V
DIN-Rail MountingVVVVVVVVV
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