3. Adaptateur en cours d'utilisation
3.1 Correction system time
GCAN-401 has integrated system clock, system clock and file system can record data by date.
GCAN-401 will create folder every day named by date. Bus data will be automatically deposited in the corresponding folder.
GCAN-401 will create a new file per minute, data will saved to the corresponding file.
If GCAN-401 adapter’s system clock not real before use, user can adjust their own time by following methods.
1. Use an USB cable to connect the GCAN-401 and PC .(USB port in Figure 3.2)
2. Use serial debugging assistant send your time to the adapter.
(serial port baud rate: 115200, data bits: 8, stop bit: 1, parity bit None, instruction is: “NT = XXX”. For example: send “NT = 20170329215500”, will amend the system time to March 29, 2017 21:55:00. Please note that, send and receive in ASCII and select “send new line”, don’t choose “hex”.)

Figure 3.1 GCAN-401 correction system time interface
3.2 CAN bus configuration
GCAN-401 adapter generally require users to set the CAN-Bus communication parameters according to the actual demand before use.
3.2.1 CAN-bus baud rate configuration
GCAN-401 can support some commonly used baud rate between 10K~1000K. Baud rate can be set by code switch, the code switch position as shown in figure 3.2.

Figure 3.2 GCAN-401 profile
The code switch “1, 2, 3, 4” can set the CAN-Bus baud rate, and the other switch (5, 6, 8) has a special definition, the default side down, please do not arbitrarily set. Dial the code switch down the default is 0, each baud rate as shown in the table 3.1.
Note: Modify the baud rate must power down

Table 3.1 GCAN-401 Baud rate configuration chart
3.2.2 CAN-Bus terminal resistance configuration
GCAN-401 has been integrated internal 120Ω terminal resistor, users can choose whether access through dial the code switch.
3.3 Connect to CAN
CANCOM adapter connect to CAN-Bus as chapter 2.2, CAN_H to CAN_H, CAN_L to CAN_L.
The CAN-bus network adopts topological structure, only the two furthest terminal need to connect 120Ω terminal resistance between CAN_H and CAN_L. For branch connection, its length should not be more than 3m. CAN-bus nodes connection as shown in figure 3.1

Remarque : le câble du bus CAN peut utiliser un câble à paires torsadées ordinaire ou un câble à paires torsadées blindé. La théorie de la distance maximale de communication dépend du débit en bauds du bus, leur relation est indiquée dans le tableau 3.1.

3.4 CAN-Bus terminal resistance
Afin d'améliorer la fiabilité de la communication et d'éliminer la réflexion des bornes du bus CAN, les deux bornes les plus éloignées doivent connecter une résistance terminale entre CAN_H et CAN_L, comme le montre la figure 3.2. Les valeurs de la résistance terminale sont déterminées par l'impédance caractéristique des câbles. Par exemple, l'impédance caractéristique est de 120Ω.

Note: CANCOM adapter not integrated 120Ω terminal resistance, users must connect it if necessary.
3.5 System LED
GCAN-401 adapter with one SYS indicator, one CAN indicator to indicate the adapter status. More functions are shown in table 3.3 and 3.4.

When GCAN-401 adapter power on, SYS LED blinking, indicates the adapter has power supply, the system is initialized; Otherwise, a system power failure or system errors has exist.
When power up, CAN LED on indicates TF card error.
When CAN LED on and then off, indicates TF card work fine .
When adapter receive data, CAN LED will blinking.