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McQuay Micro Tech Open Protocol Driver Manual
1.3
MicroTech Communication Port Configuration
In addition to the rules about MicroTech architecture and addressing, there is also a critical parameter called the
Comm Port Configuration. The Comm Port Configuration must also be set correctly for a unit controller to be able
to communicate. This comm port configuration for level 1 devices is different to level 2 devices. While it is
necessary to know this for proper unit controller setup and for troubleshooting communication problems, it is not
critical from the FieldServer side for programming or routing.
A level 1 device must have its communication port configuration set up as "Level 1 TTY/Slave". To change this
configuration, connect to the unit controller with MicroTech Monitor software through the "A" port, proceed to
the "Read/Write" screen, read memory address "0A11", and change the value to "C1" (Level 1 TTY/Slave). After
doing this, the controller must also have its rotary hex switches set to the Level 1 address of "00" to make the unit
controller's network address 00.00. Please note that power must be cycled to the controller for this new hex
switch setting to take effect.
Figure 6. MicroTech Network with BACdrop Panel as Level 1 Device
BACdrop
Hot
L2
Neutral
L1
GRD
WHT
BLK
WHT
BLK
WHT
BLK
Notes:
1. Twisted, shielded pair cable must meet the following
minimum requirements: 300 V, 60°C, 20 AWG, polyethylene
insulated, with a PVC outer jacket and drain wire (Belden
8762 or equivalent). Some local codes may require the use
of plenum rated cable.
2. 10BaseT Ethernet cable. To directly connect a PC to the
Ethernet port, a hub or a special crossover cable must be
used.
3. Cable length must not exceed 5000 ft (1524 m).
4. Standard serial cable. A null modem is not required.
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262 2299 Fax: (408) 262 2269 Toll Free: (888) 509 1970 email: support@fieldserver.com
Ethernet
100 – 240 V ac
Power
RJ-45
See note 2
Network
+
–
GRD
PC
DB9
See note 4
WHT
WHT
BLK
BLK
WHT
WHT
BLK
BLK
Legend
B+
3rd-party BAS
PC
WHT
WHT
BLK
BLK
WHT
BLK
Field wiring terminal
Field wiring: discrete
Field wiring: twisted, shielded pair cable
with drain wire (see note 1)
Field wiring: 10BaseT Ethernet
Standard serial cable
Factory wiring
Crimp or solder splice
Page 11 of 43
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