Solid State Cooling Systems THERMOCUBE II - RS-485 Communications

THERMOCUBE II 200-650W THERMOELECTRIC CHILLER MANUAL 52-14790-1
SOLID STATE COOLING SYSTEMS, 167 MYERS CORNERS ROAD, WAPPINGERS FALLS, NY 12590 27
TELEPHONE: (845) 296-1300, FAX: (845) 296-1303, WEB: WWW.SSCOOLING.COM VERSION M2
7.3 RS-485 COMMUNICATIONS
ThermoCube II RS-485 communications use the same commands
as the RS-232 protocols listed in Sections 7.2.1 and 7.2.2. The RS-
485 communications specification is shown below.
Wiring: Proper wiring depends upon whether the equipment being cooled (the Host) is wired as Data
Computer Equipment (DCE) or Data Terminal Equipment (DTE)
Table 1: Signal definition and full duplex wiring for Host wired as DTE
ASML/DTE
Male 9-Pin D-sub Pin #
ThermoCube/Chiller/DCE
Female 9-Pin D-sub Pin#
2 T1 (Transmit – T+)
2 T1 (Transmit – T+)
7 T2 (Transmit – T-)
7 T2 (Transmit – T-)
3 R1 (Receive – R+)
3 R1 (Receive – R+)
8 R2 (Receive – R-)
8 R2 (Receive – R-)
5 (Ground)
5 (Ground)
Note: Use a null modem cable if your RS-485 is set up as a DCE.
Communication Specification
Speed: 9600 baud for HEX, 57,600 baud for ASCII
Data Flow Control: None
Data Format: 8-bit serial
Data Transmission Wired for full duplex, but transmissions must be half duplex (no
simultaneous requests/transmissions)
Number of Start bits 1
Number of Stop bits: 1
Parity: None
Master/Slave: The ThermoCube is always the SLAVE (DCE)
Interrupts Reported: None, must be polled for status
Transmission Length: 100 meters
Data Update Frequency: Once per second
Maximum Polling Frequency: One command every 200msec
Maximum Response Time: 200msec
Data Format: See Sections 7.2.1 and 7.2.2
Female DB9