The serial line 2 is used to communicate with devices supporting the Modbus protocol as either a master or slave and ASCII Protocol (printer, modem...) and supports RS485 only.
|
Characteristic |
Description |
|
|---|---|---|
|
Function |
RS485 |
|
|
Connector type |
Removable screw terminal block |
|
|
Isolation |
Non-isolated |
|
|
Maximum baud rate |
1200 up to 115 200 bps |
|
|
Cable |
Type |
Shielded |
|
Maximum length |
15 m (49 ft) for RS485 |
|
|
Polarization |
Software configuration is used to connect when the node is configured as a Master. 560 Ω resistors are optional. |
|
|
5 Vdc power supply for RS485 |
No |
|
The following figure shows the pins of the removable terminal block:
|
Pin |
RS485 |
|---|---|
|
COM |
0 V com. |
|
Shield |
Shield |
|
D0 |
D0 (B-) |
|
D1 |
D1 (A+) |
Refer to Removing Terminal Block.
The following graphic show the status LED:
The table below describes the serial line 2 status LED:
|
Label |
Description |
LED |
||
|---|---|---|---|---|
|
Color |
Status |
Description |
||
|
SL2 |
Serial Line 2 |
Green |
On |
Indicates the activity of the serial line 2. |
|
Off |
Indicates no serial communication. |
|||
