Specifications

Control Interface Module, Continued
Note: RS-485 serial ports are designed to comply with the Profibus
standard. The pin layout is below.
DB-9 Pin# RS-232 RS-485 Modbus
1 - -
2 RX 5 V Pwr
3 TX Line B (RxD+/TxD+)
4 - -
5 GND Common
6 - -
7 RTS -
8 CTS Line A (RxD–/TxD–)
9 - -
Table 2-2: Serial Port Pin Layouts for CIM
• Intrinsic Safety Grounds – The touch screen display is designed
as an intrinsically safe device. This means that it is designed
such that it cannot be a source of ignition for flammable vapors
or gases, even when a fault exists. This protection requires two
ground connections to the chassis. These ground connections
must also terminate to two different terminals. The Maxum II
Modular Oven is shipped with these grounds connected
correctly. Refer to the Maxum II Explosion Protection Safety
Standards Manual (A5E02220442001) for more information on
the safe use of intrinsically safe circuitry in the Maxum II.
The intrinsically safe (IS) design for IS devices in the Maxum II (e.g. CIM
Display and ISTCD) requite two (2) connections to ground.
Disconnecting of either ground violates this protection. Refer to the
Maxum II Explosion Protection Safety Standards Manual
(A5E02220442001) for more information on the safe use of intrinsically
safe circuitry in the Maxum II.
CAUTION
• Purge –The purge detect signal is received from the PECM-DC
and distributed to the CIM Display (purge fault LED) without
software intervention (purge fault causes LED to light whether
software is running or not. In addition, the signal is also handled
by the software as a digital input to generate a purge alarm.
• 24V Power Connection – This connection is the power for the
entire CIM assembly supplied from the PECM-DC (orange
connectors on the upper left corner of the PECM-DC). Although
two connectors exist, only one is currently required.
2-8 A5E31405710001