PCI Communication User Manual 16
2.3.3.4 Termination Setup (for PCI-1602B/1602C/1612B/1612C/1622B/1622C)
If necessary, you can set termination resistors to match the impedance. Each signal
line (Tx, Rx) has a separate resistor.
Termination is recommended for when designing an RS-422 interface. RS422 Mode
with a terminator resistor is 120 Ω under standard conditions. However, the transmis-
sion condition is affected by the impedance of the cable length.
Figure 2.10 Impedance Selection (PCI-1600 Series)
Note! Especially in fields with serious electric noise, setting termination resis-
tors is helpful to stabilize communications. Ensure that both sides of the
RS-485 bus have termination resistors. See Sections 5.2.2 and 5.2.3 for
further details.
Table 2.4: PCI-1600 Series Impedance Selection Jumper Position
Model CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
PCI-1602B CN2 CN4
PCI-1602C CN2 CN4
PCI-1612B CN5 CN6 CN7 CN8
PCI-1612C CN5 CN6 CN7 CN8
PCI-1622B CN2 CN3 CN4 CN5 CN6 CN7 CN8 CN9
PCI-1622C CN9 CN10 CN11 CN12 CN13 CN14 CN15 CN16
PCI-1602UP CN2 CN4
Note! Do not set termination resistors under RS232 mode.
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