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3. Hardware Installations
24
SPI-8451-LLVA, SPI-8452-LLVA, SPI-8451-LVA
RS-422 / RS-485 specifications
- Transmission system: Asynchronous, half-/full-duplex serial transmission conforming to
RS-422/RS-485
- Baud rate: 50 - 115,200bps (programmable)
- Signal extensible distance: 1.2km Max.
RTS#
JP3: 7-8
TXD
D
JP3: 5-6
JP3: 4-6
R
RXD
47
k
Ω
6.2kΩ
6.2
k
Ω
47k Ω
R
CTS#
47
k
Ω
6.2kΩ
6.2kΩ
47k Ω
RTS#
D
JP2: 3-4120 Ω
JP2: 1-2
120 Ω
JP2: 7-8
120 Ω
10 5
61
JP2: 5-6120 Ω
+5V
CN7
Terminating Resister
Figure 3.1. RS-422 / RS-485