ZKTeco SilkID F21-ID Installation Manual page 7

11
RS485 Connection
PC Connection
485B
485A
GND
TXD
RXD
GND
WD1
WD0
Important Notes:
1. RS485 communication wires should be a shielded and twisted pair cable.
2. RS485 communication wires should be connected in a bus cascade instead
of a star form, to achieve a better shielding e ect by reducing signal re ec-
tion during communications.
3. Adjust the communication speed as needed. The signal quality vary depend-
ing on wiring conditions, and it maybe necessary to lower the baudrates.
4. The GND Signal may be omitted if and only if the GND potential di erence
is less than ±5V
2.4 Inch TFT Time Attendance & Access Control Terminal INSTALLATION GUIDE
1
8
PIN DESCRIPTION WIRE
1 485B Yellow
2 485A Blue
3 GND Black
4 TXD Purple
5 RXD Gray
6 GND Black
7 WD1 White
8 WD0 Green
Do not use
RS485 B
RS485 A
GND
485
RS
#1 ProCapture
Incorrect RS 485 connections
x
RS485 B
RS485 A
PC
GND
485
RS
#1 ProCapture
x
RS485 B
RS485 A
PC
GND
485
RS
#1 ProCapture
2.4 Inch TFT Time Attendance & Access Control Terminal INSTALLATION GUIDE
12
#2 ProCapture #63 ProCapture
PC
#2 ProCapture #63 ProCapture
PC PC
#2 ProCapture #63 ProCapture