Lenel OnGuard - Installing Jumpers

Hardware Installation Guide
revision 7 — 71
10.2 Installing Jumpers
The following diagram describes the use of each jumper on the ISC board. The jumper is indicated by
brackets [ ]. The default shipping position is shown below.
10.2.1 RS-485 Cable Termination from Host to ISC
The device used to convert RS-232 communication to RS-485 determines the termination necessary for this
segment of the RS-485 communication bus. These communications devices, pre-bias the RS-485 signal,
which marks the state of the signal being sent and allows the line to flow for reliable communications. This
is true for most devices that are used for Host to ISC communications, but any device that has been approved
by Lenel will indicate how termination should be configured for proper operation in its documentation.
10.2.2 RS-485 Cable Termination from ISC to Downstream Modules
Termination of this section of the RS-485 bus always remains the same. Each end of the RS-485 bus must be
terminated using the on-board jumpers provided with each piece of hardware. Please refer to the termination
drawings for each component being installed in this hardware manual.
Note: This applies to Ports 2 and 3.
[J13]
OFF: Port 1, Ethernet (Cobox-micro)
ON: Port 1, serial (RS-232/RS-485)
B
ACDC
AC
GND
GND
GND
IN2
IN1
J4
J7
232 48 5
2W 4W
TXD
TR1+
RXD
TR1-
RT S
R1+
CT S
R1-
GND
TR2+
TR2-
GND
TR3+
TR3-
GND
J11
J12
S
1
U4
Lithium Ion
3V BR2325
8 7 6 5 4 3 2 1
485 232
J3
J5
J6
J9
A
C
J8
J10
J13
[J12]
OFF: Port 3 RS-485 EOL termination is not on
ON: Port 3 RS-485 EOL termination is on
[J4]
Control for Port 1, RS-232 or RS-485
[J7]
Control for Port 1, 2-wire or 4-wire
[J11]
OFF: Port 2 RS-485 EOL
termination is not on
ON: Port 2 RS-485 EOL
termination is on
[J8, J10]
OFF: Port 1 RS-485 EOL
termination is not on
ON: Port 1 RS-485 EOL
termination is on
[J3, J5, J6, J9]
Control for Port 1, RS-232
or RS-485