BEIJING HUAHUAN ELECTRONICS Co., LTD.
H9MO-1641S User Guide V2.2
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12
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The jumpers CNM 1 and CNM 2 are used for the RS485 bus termination. When the unit is
defined as a terminal device, the jumpers must put on the left hand side, otherwise, put them on
the right hand side.
RS232 RS485
Pin
Number
1 2 3 4 5 6 7 8 9
Definition
Rx
Tx
Gnd Rx- Rx+ Tx- Tx+
Table 3.7 DB9 (SV port) pin assignment
3.3.4
Data Port Interface
The H9MO-1641S supports one transparent asynchronous data port with fixed rate of 9600
bps. This data port can be used for low speed data communication or remote monitoring. The pin
assignment is the same as the SV port and shown as table 3.7.
3.3.5
Alarm Output Connector
The wire wrap pin alarm connector is used for external audible (bell) or visible (light) alarms.
These conditions are defined by inputting the required outputs into the management system.
When using the rack alarm controller for power and alarm monitoring, plug in the accessory
cable which comes with the controller as shown in figure 3.8. The alarm controller supports both
audible and visible alarms simultaneously.
Figure 3.8 Alarm connector
3.3.6 Grounding
Connector
For the safety of operating personnel, the equipment must be earthed. A screw type
grounding point is located on the rear panel of the H9MO-1641S.
3.3.7
Power ON/OFF Switch and Receptacle
The power supply can be either AC 220V or DC -48V. For DC supply, connect the supply as
shown on the panel. When AC supply is used, plug in the power cable to the receptacle which
equipped with 1A fuse.
(Caution: The AC supply must be earthed for safe operation.)