USR IOT USR-M100 - Page 9

User Manual
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shown in table 1. The PIN assignments are also marked on the device’s nameplate, in order to avoid confusion.
Table 1 Terminal pin assignments
Terminal block1
Definition
DO1 NC
Relay Output 1 normal close
DO1 COM
Relay Output 1 Common
DO1 NO
Relay Output 1 Normal open
DO2 NC
Relay Output 2 normal close
DO2 COM
Relay Output 2 Common
DO2 NO
Relay Output 2 normal open
TX
COM 1 RS232 TX
RX
COM 1 RS232 RX
G
COM 1 Ground
A
COM 1 RS485 A
B
COM 1 RS485 B
Terminal block2
Definition
A
COM 2 RS485 A
B
COM 2 RS485 B
G
COM 2 Ground
DI1
DC Digital Input 1
COM
Digital Input 1 Common
DI2
DC Digital Input 2
COM
Digital Input 2 Common
AI1
Analog Input 1
COM
Analog Input 1 Common
AI2
Analog Input 2
COM
Analog Input 2 Common