Thermcraft XST-3-0-36-3V - Manual (Page 179)

Installation and Operation Handbook Installation
2416 Controller 1-7
Module type Terminal identity Possible functions
A B
Relay: 2-pin
(2A, 264 Vac max.)
Heating, Cooling, or Alarm output
Program event output
Valve raise or lower
Logic: non-isolated
(18Vdc at 20mA)
+ − Heating, Cooling, or Alarm output
PDSIO mode 1,
PDSIO mode 2,
Program event
Triac
(1A, 30 to 264Vac)
Heating, Cooling,
Program event
Valve raise or lower
DC control: non-isolated
(10Vdc, 20mA max.)
+ −
Heating, Cooling.
Retransmission of PV, setpoint or
control output
Table 1-1 Module 1, 2 and 3 connections
To check which modules are installed in your particular controller, and which functions they
are configured to perform, refer to the ordering code and the wiring information on the
controller side labels.
1.2.4 Communications module
The Communications module position will accept any of the modules listed in Table 1-2
below.
The serial communications can be configured for either Modbus, or EI bisynch protocol.
Communications module Terminal identity (COMMS)
Module type HA HB HC HD HE HF
2-wire EIA-485 serial
communications − − −
Common A (+) B ( −)
EIA-232 serial
communications − − −
Common Rx Tx
4-wire EIA-485 serial
communications − A ′
(Rx+)
B ′
(Rx −)
Common
A
(Tx+)
B
(Tx −)
PDSIO Setpoint
retransmission − − − −
Signal Common
PDSIO remote setpoint input -- -- -- --
Signal Common
Table 1-2 Communications connections
Line Load