Printronix SL4M - Manual (Page 262)

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Appendix C
NOTE: For the hardware handshake XON/XOFF commands:
XON = Ctrl Q (DC1)
XOFF = Ctrl S (DC3)
FS 28 1C < 60 3C \ 92 5C | 124 7C
GS 29 1D = 61 3D ] 93 5D } 125 7D
RS 30 1E > 62 3E ^ 94 5E ~ 126 7E
US 31 1F ? 63 3F _ 95 5F 127 7F
Char Dec Hex Char Dec Hex Char Dec Hex Char Dec Hex