Instruction manual

3. WIRING
IMR01H02-E3
6
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Connection to the RS-485 port of the host computer (master)
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Communication terminal number and signal details
Terminal No. Signal name Symbol
44 Signal ground SG
45 Send data/Receive data T/R (A)
46 Send data/Receive data T/R (B)
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Wiring method
Host computer (Master)
RS-485
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Paired wire
Shielded twisted
pair wire
MA900/MA901
(Slave)
Communication terminals
MA900/MA901
(Slave)
Communication terminals
Maximum connections: Multi-point mode: 31 instruments (MA900/MA901)
Single mode: 25 instruments (MA900)
Single mode: 12 instruments (MA901)
*R
*R: Termination resistors
(Example: 120
Ω
1/2 W)
*R
44
T/R (B)
T/R (A)
45
46
SG
44
T/R (B)
T/R (A)
45
46
SG
T/R (B)
T/R (A)
SG
The cable is provided by the customer.