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38 C1552M-C (7/07)
CM9760-ALM ALARM INTERFACE UNIT
To connect a CM9760-ALM alarm interface unit to the VMX300(-E), complete the following steps (refer to the CM9760-ALM Installation/Operation
manual for detailed instructions):
1. Set DIP switch SW1 on the CM9760-ALM to use RS-232 communication on port 0.
2. Connect the alarm unit to the VMX300(-E) as described below for the appropriate communication mode:
Direct serial: Connect an RS-232 to RS-422 adapter to COM 1 or COM 2 on the VMX300(-E) workstation, and then wire the adapter to a
wall block (user-supplied), as shown in Figure 36. Using an RS-422 reversed data cable, connect the wall block to the IN port on the
CM9760-ALM.
Figure 36. CM9760-ALM Direct Serial Connection
Internet Protocol: Connect the RS-232 connector on the alarm unit to a serial port on a networked device, such as a PelcoNet encoder
(refer to Figure 26 on page 28 for a sample illustration).
3. (Optional: daisy-chaining) If you are connecting multiple alarm units in a daisy-chain series, use the data cables provided with the alarm
units to connect the first unit’s RJ-45 OUT port to the next unit’s RJ-45 IN port. You must configure each unit with a unique device address
(refer to the VMX300(-E) Server Configuration Manual for instructions).
4. After installing system hardware, complete the following configuration steps:
a. Add the ALM driver and the alarm interface unit to the VMX300(-E) server configuration. Each unit in a daisy-chain configuration must
be added to the VMX300(-E), and then configured with the appropriate settings. Note that the recommended baud rate for
communication between VMX300(-E) and the CM9760-ALM is 19200. You must set this baud rate on the Communications tab when
you configure the CM9760-ALM device in the VMX300(-E). (Refer to the VMX300(-E) Server Configuration Manual for instructions.)
b. Change the CM9760-ALM settings to the following recommended settings for VMX300(-E) communication: RS-232, 19200 baud, no
parity, 8 data bits, 1 stop bit. (Refer to the CM9760-ALM Installation/Operation manual for instructions.)
VMX300(-E)
RS-232
RS-422 REVERSED CABLE
WALL
BLOCK
TD(A
)
TD(B)
RD(A)
RD(B)
GND
+12VDC
TD(A)
TD(B)
RD(A)
RD(B)
1
2
3
4
7
6
5
8
RS-232 TO
RS-422
ADAPTER
CM9760-ALM