Product overview

When powered on, the CMeX10 Series product has an internal boot time before the product can be used. The boot time depends on the numbers of M-Bus slaves connected to the bus. The maximum boot time is approximately 10 seconds. During boot the ERR LED (red) is permanently on.

In normal operation, ERR LED (red) is off and PWR LED (green) is on. During normal communication, TX LED will flash when communication takes place from the DTE to the M-Bus 2-wire bus, and vice versa on the RX LED when M-Bus slave devices transmitting data back to the DTE.

When the product detects a light slave collision, i.e. during secondary addressing, the product will send a break signal of 45 ms on the M-Bus 2-wire bus and to the right IR interface. The product will also send a break signal (45 ms), garbage characters (200 ms) and a break signal (45 ms) again to the DTE (left IR interface and RS232 interface). This procedure makes it possible to detect slave collisions in the DTE even if the used bearer does not support break signaling, i.e. TCP/IP communication.

When the product detects a heavy collision, i.e. during secondary addressing or short circuit of the bus, the product will turn off the bus for 0.5 seconds. The product will also send a break signal of 45 ms to the right IR interface and a break signal (45 ms), garbage characters (200 ms) and a break signal (45 ms) again to the DTE (left IR interface and RS232 interface).

When the M-Bus 2-wire bus is in idle state and the idle current is too high (depending on CMeX10 Series model), the product will turn off the M-Bus 2-wire interface and restart. The ERR LED (red) will be permanently on during this state. This procedure will continue until the idle current is within acceptable level for the CMeX10 Series model.