2 Appendix Rev. A
Confidential
If the electric potential of CS1 is higher than CS2, the TM series printer is ready for
communication (the host is ready to receive data). If the electric potential of CS1 is lower than
CS2, the TM series printer is not ready for communication (the host is not ready to receive data).
If the electric potential of DR1 is higher than DR2, the TM series printer is ready for
communication (the host is ready to receive data). If the electric potential of DR1 is lower than
DR2, the TM series printer is not ready for communication (the host is not ready to receive data).
DR1 DR2 Function
H L Communication is available
L H Communication is not available
RS-485 interface connector pin assignments and functions
Pin number Signal name I/O Function
1FG—Frame ground
2 SD1 O Transmit data
3 RD2 O Transmit data
4RD1IReceive data
5RD2IReceive data
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