Trane RTHC - Maximum Acceleration Timer #1; This value indicates the time at which the UCP2 expects full acceleration of the motor to occur...

Module Power and Miscellaneous I/O
90 RTHC-SVD01B-EN
Table 13-16: Printer Interface Module Nominal Terminal Voltages (1U7)
Terminal Designation Description of Circuit
Normal Terminal Voltages for Various
Conditions
J1A-3 (BK)
J1A-4 (W)
OR
*J1A-1 (BK)
*J1A-2 (W)
* Dependent on other
modules used with
system, refer to unit
wiring for details.
IPC Communications 19.2 kbaud serial data, RS485 signal level.
Refer to Interprocessor Communication (IPC)
J2-1 or 3 to
J2-2 or 4
Input Power 115 VAC, Refer to Power Supply
J4-1 thru 9 RS 232 Port Standard RS232 signal