... current transimit, measure AV or AA CE AND ROHS DP4-1 universal digital ammeterDP4 serials power meter, high accuracy , IC chip ... structure output, high limit , low limit alarm signal output,4-20mA ,0-10mA transmittion output.RS232, RS485 communication etc. It ... limitsCommunication : RS485 or RS232 , MODBUS-RTU protocol, Or 4-20mA, 0-10mAKeyboard : 4 keys Scaling : -999 to 9999 Mounting method : Panel ...