Honeywell RM7838B Series, Manual, Page: 19 / 56

19 65-0120—1
RM7838B
INSTALLATION
1
1
120 OHM
RESISTOR
1
120 OHM
RESISTOR
A B
A B C
C (GND)
+13 VDC
RESET
1
2 3
4
5
1 2 3
MOMENTARY
PUSH BUTTON
SWITCH
S7800 KEYBOARD DISPLAY MODULE
(MOUNTED ON 7800 SERIES RELAY MODULE)
QS7800
COMMUNICATIONS
INTERFACE
CONTROLBUS
MODULE
THREE WIRE SHIELDED CABLE MAY BE REQUIRED. TWO 120
OHM TERMINATING RESISTORS ARE REQUIRED FOR
CONNECTIONS OVER 100 FEET (30 METERS). CABLE SHIELD
MUST BE TERMINATED TO EARTH GROUND AT BOTH ENDS.
IF SHIELDED CABLE IS NOT USED, TWISTED PAIR
WIRE MUST BE USED.
M1990D
L1
(HOT)
L2
1
2
A
B
C (GND) +13 VDC
RESET
1 2 3 5 4
13 Vdc
POWER SUPPLY
THREE WIRE SHIELDED CABLE MAY BE REQUIRED. TWO
120 OHM TERMINATING RESISTORS ARE REQUIRED FOR
CONNECTING OVER 100 FEET [30 METERS]. CABLE SHIELD
MUST BE TERMINATED TO EARTH GROUND AT BOTH ENDS.
IF SHIELDED CABLE IS NOT USED, TWISTED PAIR WIRE
MUST BE USED.
WHEN CONNECTING THE KEYBOARD DISPLAY MODULE DATA
CONTROLBUS MODULE™, OR REMOTE RESET MODULE
EXTERNAL FROM THE CONTROL CABINET, APPROPRIATE
MEASURES MUST BE TAKEN TO MEET EN60730 SAFETY
LOW VOLTAGE REQUIREMENTS (SEE APPROVALS).
M5006E
1 2 3 5 4
A B
1
S7800 KEYBOARD DISPLAY MODULE
(MOUNTED ON 7800 SERIES RELAY MODULE)
MOMENTARY
PUSH BUTTON
SWITCH
1
S7800 REMOTE KEYBOARD DISPLAY MODULE
2
C (GND)
+13 VDC
RESET
120
Ω
RESISTOR
120
Ω
RESISTOR
Fig. 11—Wiring the Keyboard Display Module with Communication Interface ControlBus Module.
Fig. 12—Wiring for multiple Keyboard Display Modules.