Toshiba MBP-100 Manuel D’Utilisation

 

  

51

For clarity, let’s use Equation 1 and Equation 2 in a calculation example.  Say, 
for instance, that we are going to read coil #34.  Using Equation 1, we can 
determine that coil #34 resides in register #3, as 

⎣3.0625⎦ = ⎣3 r1⎦ = 3.  Then, 

using Equation 2, we can determine that the bit within register #3 that coil #34 
targets is (34-1)%16 = 1, as 33%16 = mod(3 r1) = 1.  Therefore, reading coil 
#34 will return the value of register #3, bit #1. 
 
Note that this discrete-to-register/bit relationship holds true regardless of 
whether or not register #3 is assigned to a point.  If register #3 is not assigned 
to a point, then a Modbus exception will be returned.  Either way, coil #34 will 
always access register #3, bit #1. 
 
 

• 

Broadcast (for functions 5, 6, 15 and 16) is supported. 

 
• 

Network characteristics selections 

o

 

Baud rate: 2400 / 4800 / 9600 / 19200 / 38400 bps 

o

 

Parity: odd / even / none (1 stop bit) / none (2 stop bits) 

 
 

• 

Supported Modbus master functions are indicated in Table 4.  These 
functions are automatically invoked by the gateway in response to point 
read or write requests.  The specific read or write function code used 
depends on the point’s assigned configuration. 

 

3 

Read multiple registers 

4 

Read input registers 

6 

Write single register 

16 

Write multiple registers 

 
 
• 

The slave response timeout (in seconds) is assigned via the designated 
port’s “Timeout” selection.  If “0” is chosen (an invalid timeout time), the 
gateway will use a 2s timeout by default. 

 
• 

Network characteristics selections 

o

 

Baud rate: 2400 / 4800 / 9600 / 19200 / 38400 bps 

o

 

Parity: odd / even / none (1 stop bit) / none (2 stop bits)