CK721-A Network Controller
Hardware Installation
24-10025-237 Rev. –
6
Connecting CK721-A to the Network
The CK721-A RJ45 port is designed to connect to a switch using pins 1, 2, 3, and 6, wired
straight through.
Figure 4: Switch to CK721-A Wiring
Connecting CK721-A to a Terminal Emulator (RS232 Serial Null Modem Cable Wiring)
The minimum required connections to a standard laptop/serial DB9 port are:
Wiring CK721-A and Other Modules
Table 4: RS232A to DB9 Connection
RS232A at the CK721-A
Serial Port at the PC
2 RX
3 TX
Where:
TX=Transmit
RX=Receive
SC=Signal Ground
3 TX
2 RX
5 SG
5SG
Table 5: Cable Requirements
Description
Recommended Cable Type
Maximum Segment Length
+24VDC
Listed, 18 AWG, Stranded, Hook-up wire.
Limited to within cabinet
RS485 A and
RS485 B
Listed, 22 AWG, Stranded, Hook-up wire.
Limited to within cabinet
Listed, 18 AWG, 3-cond, stranded, shielded. 4000 ft (1215 m). All modules connected to a
single CK721-A panel must be within 4000
feet of the panel.
Inputs ICOM1
and ICOM2
Belden 88442, 1 twisted pair, 22 AWG.
500 ft (152m)
Output/Relay
OUT1
Belden 8461, 1 twisted pair, 18 AWG.
Depends on power requirements of the door
strike. Voltage to the strike must not be
reduced more than 10% over the 18 AWG
wire.
RS232 A
Listed DB9 F/F AT Null Modem
25 ft (7m). Cable must remain in the same
room as the CK721-A.
RS232 B
Listed DB9 F/F AT Null Modem
25 ft (7m). Cable must remain in the same
room as the CK721-A.
Ethernet
Listed, Category 5, 24 AWG, solid, 2 pair or 4
pair type.
328 ft (100 m). Cable, RJ45 connector, and
RJ45 crimp tool to be supplied by customer.
NC
NC
RXD-
NC
NC
RxD+
TxD-
TxD+
8
1
NC
Output Transmit Data -
NC
NC
Output Transmit Data +
Input Receive Data -
Input Receive Data+
8
1
NC
CK721-A
RJ 45 port
Switch
RJ 45 port
